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pic18f2550, c18 - what setting to choose for cpudiv?
pll // prescaler selection bits:plldiv = 1 // no prescale (4 mhz oscillator input drives pll directly)plldiv = 2 // divide by 2 (8 mhz oscillator input)plldiv = 3 // divide by 3 (12 mhz oscillator input)plldiv = 4 // divid...
Microcontrollers :: 14 Nov 2009 22:19 :: hkBattousai :: Replies: 20 :: Views: 642
pic 16f84a uart problem
hii am using mikroc to program my 16f84a as u know it doesnot have a hardware uart pins so i am using the soft_uart library provided with mickroc ( it is the same provided with mikrobasic and mikropascal ) i have programmed the pic with a simple test...
Microcontrollers :: 12 Nov 2009 21:53 :: minep :: Replies: 5 :: Views: 1839
radiated emission from quartz
hi guys,im new here and i am asking your suggestion to solve a radiated emission problem thats afflicting a device i am working on.i am facing high radiated emissions from a quartz running at 20 mhz frequency (checked that the quartz was the emitter ...
Professional Hardware and Electronics Design :: 10 Nov 2009 19:24 :: FvM :: Replies: 3 :: Views: 90
frequency generator output causing problem
hi,i designed a simple 3 channel frequency measuring unit with pit(82c54) and a microcontroller. it measures the frequency from 3 channels simultaneoulsy and display it in an lcd. i am using the read-back function of pit to indicate the null count. a...
Analog Circuit Design :: 10 Nov 2009 9:53 :: PRAVEEN K :: Replies: 2 :: Views: 102
gsm modem with pic 16f877a
my project is send message from pic to handset through gsm modem..i know we can used hyperterminal and at command..but, how ?what kind of languange can used..c or assembly..what software and compiler need...plz help me...this is my circuit for interf...
Microcontrollers :: 10 Nov 2009 8:56 :: amila133 :: Replies: 17 :: Views: 3246
square wave generator
i need to design 11.0592mhz square wave generatori need help in thatthanks....
Analog Circuit Design :: 08 Nov 2009 13:26 :: n_huda2006 :: Replies: 10 :: Views: 645
locked atmega ...
is it possible to reset or do something with locked atmega 8. what i mean by locked is that while programming something happened and chip got locked. now i cant erase it, reprogram it or do anything with it. well at least not with standard isp progra...
Microcontrollers :: 08 Nov 2009 13:10 :: ctownsend :: Replies: 85 :: Views: 11899
video pattern generator
video pattern generator with pic16f84 and mc1377...
Hobby Circuits and Small Projects Problems :: 03 Nov 2009 23:57 :: betwixt :: Replies: 23 :: Views: 7574
crystal vs crystal oscillator differences?
i have not been able to find the stated differences between a crystal and a crystal oscillator.can someone please explain the pros and cons to each of these? what applications would each be better used in?looking at the datasheets it looks as though...
Electronic Elementary Questions :: 31 Oct 2009 6:47 :: Jack// ani :: Replies: 1 :: Views: 156
pic microcontroller does not work
dear all,i am facing a problem in testing a very simple code with pic16f73.i just want to set the pa0 pin high, so that i can see the led switched on.but unfortunately i cannt see this happening in the hardware.but at the same time i can see the same...
Microcontrollers :: 29 Oct 2009 15:55 :: peacezim :: Replies: 15 :: Views: 618
coil less fm transmeter
any body can prov. me ;coil less fm transmeter; or ;ic based fm transmeter; max 10 meter rang....
Hobby Circuits and Small Projects Problems :: 27 Oct 2009 17:48 :: sajal1975 :: Replies: 5 :: Views: 423
change the frequency of the transmiter
how can i change the frequency from the external tuning port on this chip???use pin12??or waht??...
RF, Microwave, Antennas and Optics :: 25 Oct 2009 17:14 :: FANT :: Replies: 3 :: Views: 153
microphonic problem in frequency synthesizer unit
hi i bought frequency synthesizer unit and i found if i applied vibration to that unit waveform comming out form synthesizer is not remain good .i can see lots of spur during vibration.can anyone suggest me what shoud i do?...
RF, Microwave, Antennas and Optics :: 23 Oct 2009 21:40 :: biff44 :: Replies: 1 :: Views: 69
project to replace cy7c64613 in the icd2
i am evaluating the posibitity to replace the cypress usb on the icd2 with a pic18f2550 or similarreasons for this are:-cy7c64613 seems to be dificult to obtain. -lower price ($20 vs $10). -smd package requires a pcb and more or less skilled solderin...
Microcontrollers :: 23 Oct 2009 17:33 :: SG61-addict :: Replies: 1847 :: Views: 374294
low jitter clock generation with a external crystal
hi folks:we are leaning to design a clock generator with a external crystal. whats the term people use for such kind of circuits?just want to better shoot at the searching. regards,neo...
Analog IC Design & Layout :: 21 Oct 2009 21:23 :: JoannesPaulus :: Replies: 14 :: Views: 603
vhf/uhf transmitter- how to change the frequency?
rfmd,rf2514,i want to know how to change the frequency?the dt said ,it can fine-tuned via internal varactor diodes, but when i change the voltage of pin10, the frequency didnt change,,,,,who can help me??thanks...
RF, Microwave, Antennas and Optics :: 20 Oct 2009 17:07 :: Mazz :: Replies: 11 :: Views: 681
regarind sleep instruction in pic18f452
well i am workiong on pic 18f452, using c18 compiler and using mplab 6.62plz have a look at this code : when i run this code in the simulator and watch on the timer 1 contents, the timer 1l dont increase from 0, and as aresult program never comes out...
Microcontrollers :: 20 Oct 2009 4:34 :: sairasaleem :: Replies: 8 :: Views: 648
a question on the xtal osc deisgn
is a typical cross-coupled oscillator.the negative impedence anlaysis is ok. but i can not make it oscillate.would anyone pls. tell me any wrong with the schematic? is ithis topology suitble for the crystal osc deisgn?thanks in advance...
Analog IC Design & Layout :: 17 Oct 2009 4:05 :: chang830 :: Replies: 13 :: Views: 567
gsm sms 8051 controlling relays
dear friends, ok .. thr is a lot of discussions on sending the sms through mobile phonelets now talk abt receiving sms and making a relay on with 8051 controller. if some one has done anything.. about this using at commands, please share it---> reply...
Microcontrollers :: 13 Oct 2009 16:33 :: vicky89 :: Replies: 54 :: Views: 6382
4060 lc oscillator design
hi can any one show me how to design lc oscillator using the 74hc4060 need some schematic and frequency design formula all the best bobi...
Analog Circuit Design :: 10 Oct 2009 16:48 :: pauloynski :: Replies: 2 :: Views: 297
feeding data from pc to on-chip dac through uart
hi everyone, i want to send a file from my laptop to pic33fj128gp802 through uart and then pass the data to on chip dac. the file contains samples of a sinusoidal signal, which was sampled at 8038hz. i managed to write the code, which as i thought sh...
Microcontrollers :: 03 Oct 2009 19:34 :: x3.exe :: Replies: 4 :: Views: 255
the possibility of osillation with low amplitude
hello!i have got an abstract question a little bit. i wonder if an amplifier or another circuit can oscillate without reaching rail-to-rail amplitude if the circuit is unstable. if it is possible, do you you have such experience or could you please g...
Analog IC Design & Layout :: 25 Sep 2009 16:27 :: dick_freebird :: Replies: 7 :: Views: 258
an oscillator with multiple positive feedback
if an oscillator has multiple positive feedback paths,it oscillates at plural frequencies or at a certain frequency??...
Electronic Elementary Questions :: 22 Sep 2009 1:38 :: biff44 :: Replies: 6 :: Views: 366
attiny 2313 programming in avrstudio4
hi all.. i am working on attiny2313. from past two days i am trying to send & receive data to tiny2313 through rs232. program is very simple & i found it from net but not working. according to datasheet i have to burn the fuse, if i am using ...
Microcontrollers :: 18 Sep 2009 15:36 :: vinstudy :: Replies: 7 :: Views: 474
will there be any voltage????
do i get any voltage in the crystal oscillator connected externally to the atmega16l...when the mc is switched on.......
Electronic Elementary Questions :: 18 Sep 2009 7:34 :: FvM :: Replies: 3 :: Views: 126
need help with cmos, ttl and pierce oscillator
so heres my situation currently, im trying to build a crystal oscillator circuit that would work for a 40khz ultrasonic sensor, model ssqc sq-40t and ssqc sq-40t. ive done a decent amount of research about this but im not sure which oscillator is mos...
ASIC Design Methodologies & Tools (Digital) :: 17 Sep 2009 17:37 :: losties :: Replies: 0 :: Views: 132
need pll scheme or special solution to fit the requirements
me that works at about 2.5ghz and can lock the frequency as well as the phase within 1 us. i think maybe many plls can do this. but the special thing is that the current system use an universal 48mhz crystal and we can not apply the frequency changes...
Analog Circuit Design :: 16 Sep 2009 11:14 :: mqblue :: Replies: 2 :: Views: 264
cheap way to lock 24 ghz signal drift?
lets say i was operating 24.0 to 24.25 ghz ism band, and the vco had a built in divide by 16. anyone have a neat way to determine if i am tuning outside of that band (drift/aging/temperature) using the divider output. can not find a cheap off the s...
RF, Microwave, Antennas and Optics :: 15 Sep 2009 0:36 :: biff44 :: Replies: 2 :: Views: 126
about crystal osc design- waveform is not smooth
i found that the waveform of my crystal oscillator is not smooth,it is the sine waveform with ladder rise and fall. i guess maybe need some option in hspice,pls help me .i give the picture.http://images.elektroda.net/88_1252486892_thumb.jpg...
Analog IC Design & Layout :: 11 Sep 2009 8:03 :: godspeed.w :: Replies: 2 :: Views: 192
a crystal circuit problem,help!
one pin 455k osc resonance circuit: circuit description: this circuit used to generate a 455khz clock signal from 2v to 5v, the crystal one pin connects to the osc pin,the other pin connects to gnd.when the output of i128 changes from one to zero...
Analog Circuit Design :: 09 Sep 2009 15:07 :: dick_freebird :: Replies: 1 :: Views: 159
how to generate a high-precision sine source for ad test?
i need to test a 16bits adc, but i dont have the proper sine source?is there any idea?...
Analog Circuit Design :: 07 Sep 2009 9:17 :: dmilosd :: Replies: 15 :: Views: 1056
what crystal for a cmos inverter oscillator/clock
hi guys, im designing a cmos inverter oscillator/clock right now...when i choose for the crystal, should i choose only the crystal oscillator or any crystal would work?thanks...
Analog Circuit Design :: 05 Sep 2009 8:21 :: KS2 :: Replies: 2 :: Views: 555
what component is this?????
can anyone tell wat type of component is this. if possible can u also pls give the link for the datasheet..(sorry about the picture clarity)..pls helpthanks....http://img54.imageshack.us/img54/3096/photo0009.th.jpghttp://img132.imageshack.us/img132/7...
Electronic Elementary Questions :: 03 Sep 2009 23:01 :: barrybear :: Replies: 6 :: Views: 288
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time delay in pic16f876-a
i have developed the following program to glow an led connected to first pin of port b using mikro c...now the problem is how can i give delay value, eg 250us etc...????unsigned short i;void main() { trisb = 0; portb = 0x00; usart_init(9600); ...
Microcontrollers :: 02 Sep 2009 12:37 :: amitdandyan :: Replies: 11 :: Views: 613
dspic oscillator and pll question
hi,i want to run my dspic30f4011 in maximum speed (120mhz).so i choose a 7,5mhz crystal/resonator and set the pll to x16.but.. there are no 7,5mhz crystals or resonators.it seems all crystal series skip the value 7,5 mhz.ok, i choose 15mhz and set pl...
Microcontrollers :: 01 Sep 2009 12:11 :: aProgrammer :: Replies: 2 :: Views: 258
is it possible to make xvco from lc vco ?
hi!is it possible to make a xvco from lc vco like in fig.1? to get xvco im going to replace the l by crystal.thank you!http://images.elektroda.net/48_1251119855.gif...
RF, Microwave, Antennas and Optics :: 28 Aug 2009 8:52 :: neazoi :: Replies: 6 :: Views: 314
need help in making a low jitter clock
here, but i need this rather quickly, and i need an advise on how to build it...will regular pierce oscillator do the job?if so, what should i look for in the components(key feature) esp the cmos and crystal?thanks...
Analog Circuit Design :: 27 Aug 2009 20:50 :: FvM :: Replies: 1 :: Views: 192
ext rc oscillator for pic?
t 4.7k and 33pf will give approximately 4mhz for pic in external rc oscillator mode. i am planning to use it.is there any consequence if we use rc oscillator in a pic based product, instead of a 4mhz crystal? accuracy is no problem as my equipment is...
Microcontrollers :: 24 Aug 2009 6:23 :: Picstudent :: Replies: 2 :: Views: 192
how to get precise time with pic - help needed
im working on a small project and precise time is critical issue.how can i get precise time?thank you....
Microcontrollers :: 21 Aug 2009 3:13 :: doraemon :: Replies: 24 :: Views: 554
bb0703+,pickit2 with buck/boost circuit&upto 256k eeprom
the new released bb0703+ family (bb0703+128k and bb0703+256k) has the following enhanced features to pickit 2:1. usb buck/boost circuits, guarantee internal +5v supply at all usb normal voltage inputs situation (4.1v to 5v normal), this will secure h...
Microcontrollers :: 17 Aug 2009 22:43 :: funnynypd :: Replies: 40 :: Views: 3684
can i generate a pwm frequency of 5hz using pic16f877
the lowest possible pwm frequency using a pic16f877. ive tried using maximum values for pr2(i.e 255) and to slow down timer2 with a prescale option of 1:16, but i can only go down to 247hz.im using a crystal oscillator of 4mhz and assembly as a progr...
Microcontrollers :: 17 Aug 2009 22:25 :: millwood :: Replies: 15 :: Views: 705
ftdi - ft245bm & microchip - pic16f877a?
hello,i am developing a board which consist of these two ics. i do not know which brand of crystals oscillator to buy? i know the setup for the ftdi chip needs a 6mhz crystal with 2 capacitors and the microchip needs a 20mhz crystal oscillator with 2...
PLD, SPLD, GAL, CPLD, FPGA Design :: 12 Aug 2009 21:59 :: elrayes :: Replies: 3 :: Views: 389
pic16f627a mcu usart asynch, spbrg value query
im trying to interface a pic16f627a mcu to a pc (running linux) via an rs-232 serial interface.ive chosen to use the 16f627a as it has on-board usart. presumably the easiest method for comms is for me to use this in asynchronous mode?im a little conf...
Microcontrollers :: 10 Aug 2009 17:16 :: the_merovingian :: Replies: 2 :: Views: 231
need help to make usb icd2clone work ( 4550 & 877a versi
i built the icd according to the info posted by pics there: http://www.edaboard.com/viewtopic.php?t=161641&start=420&sid=1b18e31069a55140f08abe1a5d20b037( top of page 16)i didnt want to pollute the other thread with my struggling so i created another...
Microcontrollers :: 10 Aug 2009 12:19 :: mz_fadhli :: Replies: 70 :: Views: 13614
how can pic16f84a blink a led without external oscillator
can pic16f84a blink a led without an external oscillator or control a lcd without one?how can i do that if that is possible?thank you....
Microcontrollers :: 08 Aug 2009 17:57 :: wp100 :: Replies: 11 :: Views: 270
8051 square wavw
oscillation using uc8051 with fixed duty cycle say 50% but i want to be able to change the frequency of oscillation from 1hz to 2khz by keying in the required value and make the uc generate it. 12mhz crystal oscillator is used. pls, i need help on ho...
Microcontrollers :: 06 Aug 2009 9:37 :: osoenbolsa :: Replies: 3 :: Views: 243
sync 2 usart at the same time
im using dspic30f3014 mcu, mikro c compiler. my problem is im trying to connect cmucam(rx tx) to uart1(tx rx) and then using the uart2_write_char(uart1_read_char()); codeto transmit the data to uart2 to pc. my problem is when transmit to uart2 the ou...
Microcontrollers :: 06 Aug 2009 8:30 :: YAWN :: Replies: 0 :: Views: 126
usb - max3421e enumeration transfers
hi, im implementing the max3421e in host mode with a small microcontroller, and using the maxim c code for guidance. ive managed to transfer the detect device and detect device removal routines for my microcontroller, and now need to write the enumer...
Embedded Systems and Real-Time OS :: 03 Aug 2009 21:29 :: GetDeviceInfo :: Replies: 12 :: Views: 664
pic18f and watchdog timer?
hello guys,i am a beginner with microcontrollers and need some advice on how to implment this power saving feature.i need to put the 18f series pic device to sleep and wake it up ever 20 ms to check the state of various inputs. the main reason for th...
Microcontrollers :: 31 Jul 2009 16:56 :: M3GAPL3X :: Replies: 16 :: Views: 1560
how clk timming affects a design in fpga?
hi friends!, im doing a qpsk communication project.and using virtex-4,xilinx ise8.2i. my adcs and dacs require 100 mhz as clk input in order to work. in our circuit,we have not provided a separate crystal or oscillator for adc\dac in pcb. so while p...
PLD, SPLD, GAL, CPLD, FPGA Design :: 29 Jul 2009 7:01 :: xtcx :: Replies: 0 :: Views: 120
oscillator design in sa602
hi,i am trying to use sa602 to design a mixer/osc mainly because it is readily available and popular. the main problem i have is the oscillator design. the data sheet does not have much information on how to design the oscillator. my goal is to desi...
RF, Microwave, Antennas and Optics :: 29 Jul 2009 6:33 :: ekhorasan :: Replies: 5 :: Views: 369
pic12f508 with internal oscillator
hello,i want to use pic12f508 without external crystal osc.i have read from datasheet bit 1-0 fosc<1:0>: oscillator selection bits10 = intrc = internal rc oscillatorcan i select internal osc by setting above bits in configuration word for pic1...
Microcontrollers :: 28 Jul 2009 20:35 :: wp100 :: Replies: 1 :: Views: 177
why is odd overtone more efficient in a crystal's operation?
ive read in a book that a crystal set to work in its odd overtone is more efficiently operated compared to that of its even overtone. if anyone can explain it to me in detail, or provide a link that provides a detailed explanation, it would really be...
Electronic Elementary Questions :: 28 Jul 2009 8:36 :: FvM :: Replies: 3 :: Views: 225
vga controller board.
hi everybody.i want to design a board that drives a vga display.i have searched so much for a vga controller, but i couldnt find anything unfortunately. is there anyone that can help me or suggest any chip or any method to me for designing such a sys...
Professional Hardware and Electronics Design :: 24 Jul 2009 11:24 :: itaig :: Replies: 5 :: Views: 859
attiny 2313 programmer
hi,i need simple programmer (hardware and software) to program attiny2313 - 20 mhz,regards...
Microcontrollers :: 21 Jul 2009 10:08 :: astina76 :: Replies: 31 :: Views: 10530
about pll loop bandwidth....
dear all : i have some questions about pll loop bandwidth. 1. if decrease loop bw , in band phase noise is increase , right ? 2. if decrease loop bw , vco phase noise cant sppress , right ? ...
RF, Microwave, Antennas and Optics :: 20 Jul 2009 10:41 :: biff44 :: Replies: 17 :: Views: 1830
variable frequency from input button
lation using pic16f873a with fixed duty cycle say 50% but i want to be able to change the frequency of oscillation from 1hz to 1mhz by keying in the required value and make the pic generate it. 20mhz crystal oscillator is used. pls, i need help on ho...
Other Design :: 19 Jul 2009 12:47 :: smd_lover :: Replies: 1 :: Views: 365
digital clock using 18f4550
hie....i tried to count the second but its not working.i just take a look on some examples that is given in the ccs compiler but my program does not count the second properly. it becomes slow.any body can give me some tips about this?================...
Microcontrollers :: 16 Jul 2009 7:10 :: codewiz :: Replies: 2 :: Views: 255
pic16f877a and eeprom 24lc512 problem
hi, im having problems reading and writing a 24lc512 ext eeprom to pic16f877a. i tested using led to see if the eeprom is reading the data that i wrote into it. however the only result that im getting is that the eeprom reads 0xff no matter what data...
Microcontrollers :: 14 Jul 2009 9:19 :: dilraj.n :: Replies: 1 :: Views: 390
test pic microcontroller
i have written a simple led program which makes portb highand leds glow.i am able to program it.but there is no output at portb. what does this mean is the pic working or not....
Microcontrollers :: 14 Jul 2009 0:28 :: codewiz :: Replies: 7 :: Views: 277
1 mhz clock generation - need suggestion of oscillator
i have to design a circuit for clock generation. clock frequency is in the range of 1 - 10mhz and the special requirement is stability over temperature (lower then 2%) and tunability of oscillation frequency with 10 bits (step of 500hz).i think that ...
Analog Circuit Design :: 11 Jul 2009 11:57 :: mengcy :: Replies: 5 :: Views: 309
irda through rj45
hello,i am very curious about this circuit and an estimation of the data transfer that it can work.http://www.electronics-lab.com/projects/pc/023/index.htmlalso, do you think it can work with a laser diode? (i do not see the reason why not)...
Network :: 07 Jul 2009 14:56 :: GSM Man :: Replies: 3 :: Views: 278
motor controlling pid ic
hi,i am looking for a single chip to control a motor. this chip should have 3 pwm outputs and an encoder inputs with programmable control rule.i found all that in a single chip lm629 but i cant find a normal way to program it. may be you can direct m...
Robotics and Automatics Forum :: 01 Jul 2009 11:05 :: swakit :: Replies: 45 :: Views: 7540
7 segment???
hi,i have an adc converterted value.i want to display this value in 7 segment display.the value is 4 digit value.so i have connected four 7 segments individually and multiplexed through four transistors.(i.e.each 7 segment is connected through a tran...
Microcontrollers :: 26 Jun 2009 17:10 :: Kaleborg :: Replies: 13 :: Views: 1035
sample code for lcd
hi im trying to get my lcd working.. but so far nothing seems to be working..im using a lc60 microcontroller and my lcd module is 164a-bc-bc from displaytech. can anybody help me? jus post a sample prog so that i can at least get 1word or so.. and my...
Microcontrollers :: 25 Jun 2009 14:07 :: yasir9909 :: Replies: 8 :: Views: 639
wireless speech transmission helppp
hey guys im trying to implemnt an analog wireless speech transmission circuit having pll and vco in the local oscillator part and i will use the 433 ism frequency band. fistly, i did not have an idea about how i do the project...
RF, Microwave, Antennas and Optics :: 23 Jun 2009 14:05 :: enkavak :: Replies: 5 :: Views: 327
what are capacitor values used with crystal oscillator 20mhz
hi! i want to knw what is the capacitor values used with crystal oscillator 20mhz. how to calculate it? and why capacitor is needed?thanks...
Microcontrollers :: 20 Jun 2009 12:27 :: pranam77 :: Replies: 5 :: Views: 480
restarting my pic 16f877a
i am using pic 16f877a, with wdt-disable, hs-16mhz uses 22pf, other cofiguration bits are disabled. it doest work well. i think the problem is with the oscillator...what can i do......
Microcontrollers :: 19 Jun 2009 12:07 :: ankit.ec05 :: Replies: 9 :: Views: 414
problem using timers with pic18f4550, help needed?
hi alli just want to use timer0 in pic18f4550 and really im tired of reading and trying, beside im a very bad programmer, so try to help me in this code, im using mplab c18 compiler, this code is used to light some leds on port d when the timer expir...
Microcontrollers :: 15 Jun 2009 9:58 :: L Varalakshmi :: Replies: 5 :: Views: 672
crystal oscillator strange simulation problem.call for help!
im simulating the crystal oscillator proposed by eric a.vittoz(high-performance crystal oscillator circuits: theory and application).the schematic is as follow. when i run a transient simulation, the simulation results are strange .the current of pm...
Microcontrollers :: 13 Jun 2009 9:32 :: hhq414 :: Replies: 5 :: Views: 291
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