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I see in the attached image timer input frequency is CK_INT or internal CLock 136221. Is internal clock it is refering to is Sysclock or APB1 clock or any other. Please help i cannot get this information in datasheet;136222
hello, read again Susan's response on #3 prescaler set to 1/8 Fosc=8Mhz timer0 will count from 6 to 256 ( because of 8 bits size 256 => 0 !) so TMR0IF flag will be set after 256-6=250 pulses FOSC=8 Mhz internal cycle duration 4/8= 0,5 ?S periode * 8 because divider = 1/8 250* 4/8 * 8 = 250 * 0.5 * 8 = 1000 ?S => 1?S if you are lazy,
PIC32 and most other microprocessor don't have a separate RTC power supply, so the battery consumption will be much higher than with a dedicated RTC. The internal RTC isn't suitable for longer backup periods with a small battery.
Hi dann11, First you should bring up your micro controller, i.e implement necessary system clock(with internal or external oscillator) & look in to necessary peripherals like GPIO, timer, UART, SPI etc... Generally push button is connected to the GPIO, as per the GPIO input high/low you can implement your logic.. Let me know if you any specific
I want to use internal oscillator for all clocks and timers and other operations which bits should I chose? 128976 18F46k22
Hello, I try to use interrupt with pic18f14k50. (RA4 pin as IOC pin). But I cant find where I mistake. Anytime doesnt run part of ioc in interrupt routine. Same time I use timer interrupt for 1us. I use internal oscillator 16Mhz. sbit LED0 at LATC4_bit; sbit LED0_Direction at TRISC4_bit; sbit LED1 at LATC3_bit; sbit LED1_Dir
Microchip has excellent documentation for all the PICs. Please download and see the details. I do not think you can access the internal PLL.
You could try to use a 74HC5555, it is a 555 with a internal divider for long time periods. If you set it to 17 bit (131,072) and use a 1 KHz oscillator you would get 2.184 hours, 1.1 KHz would be 1.96 hours. You would use the Q output to drive Bradtherad's decade counter and use the 74HC5555 non-retriggerable mode. Meaning that the 2 hour per
hello, typical reset circuit : 123705 if your power supply takes too long time to reach nominal value .... you can also use internal MCU power timer feature.. to wait correct FOSC..
Hello, I'd like to configure two timers with stmcubemx. I configure timer TIM2 as gated mode with trigger source from TIM3. timer counts impulses from ETR2 external clock. Now I'm not sure how to configure TIM3. I set 'Clock Source' as internal Clock but what should I set as trigger source so that I could recieve PWM (...)
Hi, That's why there are interrupts and internal periferal hardware. I don't know the internals of the 89s52. The easiest way for a 1s pulse is to set up a timer/counter periferal as wave generating mode. Then you should be able to choose frequency and duty cycle. Once set up it needs no additional processing power, and no code. The is a (...)
Basics: 1. set port pin(s) to output mode so you can control the LED 2. configure a timer, TMR1 would be best choice in your application because it has 16 bits so can be used to create longer delays. 3. configure the source to the timer, internal clock or external clock and set the pre-scaler to a suitable divisor. 4. (...)
You should inform what are the main requirements and constraints of this project, namely cost, features, etc... Anyway, I think that you should consider to use a dedicated RTC instead of occasionally synchronize an internal timer of the uC. Let suppose a condition on what the vehicle is parked for long inside a place where GPS signal is not str
Hi to all, I am into a project of "programmable timer" using real time clock with ds1307, for that I am working with Pic16f1847 and using Mikroc pro compiler for programming. I am using 16Mhz internal oscillator for clocking the device. I am using PICKIT3 programmer for building the code. My code is working fine with PIC18f4520 as per my applicatio
I want to create C code for measuring the time of an event without using timers of any particular micro Controller The original question should be reformulated, due to even operating under some RTOS, the system much likely would stay still dependant of an internal timer to supply the tick cadency.
i have used internal watchdog timer of At89c5131 clock at 8Mhz with X2=0; that means peripheral clock= (8/6) MHz .... by setting watch dog counter to maxium setting of 7 ... i.e. 16384*S^2 machine cycles gives watch dog time aprox 3.1 sec where as i want upto 4.5 sec is there any scheme/logic or way to attain that other than external hardware
Why not use an external clock with 50ppm or even 1ppm TCXO stability instead of internal > 1%? (cheap)
the timer calculation of 5000 looks correct for a PIC24FJ64GB004 (similar device with USB) I use _CONFIG2(POSCMOD_HS & I2C1SEL_PRI & IOL1WAY_OFF & OSCIOFNC_ON & FCKSM_CSDCMD & FNOSC_PRIPLL & PLL96MHZ_ON & PLLDIV_DIV2 & IESO_OFF) which with an 8MHz crystal gives SYSCLK of 32MHz and to get a 1mSec interrupt the time
Hi, I am using PIC18F65k22 with internal 1MHz frequency. I am using internal RTCC using the LF-INTOSC of the PIC since the small error in the timer is not important my application and also to reduce costs and hardware. When my CPU is running, the RTCC is working accurately. However, when CPU enters the Sleep Mode, the LF-INTOSC (...)
Hey I am trying to start timer on the positive transition from external source like when I push the button, timer start counting. The code I wrote works well with internal instruction clock but not from external source. I am really frustrated for not figure out whats wrong with this. Can someone please help me out. Please?
I use a PIC10F200 for a resettable long delay timer. It is cheap, easily available and has a precision internal oscillator so no RC network is needed at all. Works from 2V up to 5V. I use them for delays of up to one month! Current consumption is only a few uA. Brian.
Please bear with me. I've to toggle a pin every 125 milliseconds and every minute I've to update the eeprom with a value after comparing with the previous value. For measuring time I'm using timer 0 and it's ISR. Every minute I've to display the eeprom value in an LCD. My PROBLEM is that for the 1 second period the toggling is working fine, but dur
it only internal 4 MHz oscillator . from 6 or 8 MHz use External Crystal.
problem in calculating frequency? I am currently configure timer1 as free running timer clock frequency through T1CKI pin. Which i gave by generating frequency by PWM @60KHz. I am giving input to the CCP4 is 1KHz. I got following result that i store in array.(See image) Difference between two period is 198. My internal frequency (...)
You can use a 100 MHz clock oscillator. Or keep the presently used oscillator and generate a fast clock by a FPGA internal PLL. I believe that there are better FM decoder algorithms than just measuring zero crossings.
The ATtiny88 offers a clock prescaler which divides the system clock frequency by 8, 64, 256 or 1024 before input to timer0 or timer1. Reference: ATtiny48/88 Datasheet, Section: 13.1 internal Clock Source, Page: 117 13.1 internal Clock Source The timer/Counter can be clocke
HI i m new in PIC i m making a simple up counter using PIC16F676. software is working. mplab's debugger shows that. but i have some problem while configuring configure bits. i want : 1. internal oscillator of 4MHZ. 2. RA3 as I/O port. i configured as follows 93713 doesnt matter watchdog timer is enabled or d
Hi, There are a couple of different ways to produce a time delay, either by a software delay or by using the internal timer 0 of the pic chip. What times they can produce depends on the Crystal frequency you are using, so you must first state what that is. Both hard and software delays only produce delays of up to 1 second so you
Try disconnecting your reset circuit from the reset pin - leave the reset pin unconnected. See if the chip now powers up correctly. The ATmega should do an internal power-on reset when you apply voltage. As soon as the voltage rises above the threshold, an internal reset pulse is started and ended by an automatic timer. If it does not (...)
A time delay of 1 sec is to be generated and a 12MHz crystal oscillator is connected with PIC.(external clock source for the controller) mer is related to the internal frequency which is always Fosc/4. Clock source frequency (Crystal) Fosc = 12 MHz = 12000000 Hz Therefore, timer frequency : Ftimer = Fosc / 4 = 12000000 / 4 = 3000000 (...)
hello.....i want to build a real time clock using the internal timer(s) of the pic 16f877a and display the time on 16x2 lcd. I can handle the lcd commands but please upload and explain me the timer operations using the ccs pcw compiler......!
below is my full code. #include #pragma config OSC = INTIO67 //internal oscillator, xtal becomes output #pragma config WDT = OFF //Turn off watch dog timer #pragma config LVP = OFF //LVP off int i; void main(void){ OSCCON = 0b01110000; //8MHZ clock OSCTUNEbits.PLLEN = 0b1; //enable PLL //Enable interna
Can you try to switch it to internal oscillator?
Actually, the PIC maybe resetting itself due to internal reasons. Have you ensured the watchdog timer is disabled? It is enabled by default. What are you current Configuration Register settings? If you are attempting to drive the stepper motor with the same power supply as the PIC circuit, it could certainly be the source of reset as pre
hello evrybody i m trying to drive a 4 wire hdd motor with pic 16f675 so i try this schematic with the commun pin of the motor connected to 12v i m asking if it will be working with this code #include <12F675.h> #device adc=8 #FUSES NOWDT //No Watch Dog timer #FUSES INTRC_IO //internal RC Osc, n
if u are using internal clock pulse for timer 0 then it will not work, if its working on external clock pulse without synchronization then it will work
You can do this with the internal oscillator since the timing isn't crucial. A few minutes (I'm sure hours as well) here and there won't be a problem. So, there's no need to add an additional RTC chip. Any PIC with a timer should be usable. How many pins do you need in total? Take a look at PIC12F629, PIC16F630 and PIC16F628A. Hope this helps. Ta
As a guess, I would think the problem is that you don't initialize the "seconds" variable or timer ready for it's first count. The interrupt occurs when the timer has reached terminal value and rolled over to zero so if it starts frm zero it has to count it's full range of values before the first interrupt occurs. Warning - it looks like you are
hello all, I want to design 555 timer, ie tlc555 internal circuit. I have internal circuit from data sheet and now to find w/l ratios for each mosfet. I need help on how to go about it, like what parameter to consider.I am attaching data sheet with this post so that you can have a look at circuit diagram(cmos). -and any answers for (...)
Do you actually mean sleep (PIC power saving mode) or just a delay? For a precise delay, you'll use a timer. The available accuracy depends on your clock option, either internal oscillator (1 - 2 %) or crystal (e.g. 100 ppm). Power saving sleep mode can be only timed by watchdog timer which is less accurate.
timer and Counter? Sorry, i'm not sure what you want. Do you mean, it's like a Digital scoring board? Please try this, you can modify it as you like. $regfile = "attiny2313.dat" $crystal = 8000000 Dim Multiplier As Byte Dim Second As Byte Dim Score As Byte Ddrd = &H00 'Input Portd = &FF 'internal Pull-Up Ddrb = &HFF
Guys, I tried to write this code, but can't see LED blinking on PIC IDE simulator Do you know why ? Thanks #include #include #pragma config FOSC = INTOSCIO_EC //internal oscillator, port function on RA6, EC used by USB #pragma config WDT = OFF //Disable watchdog timer #define LEDPin LATDbits.LATD1 /
Please read the interrupt chapter of the microcontroller datasheet, maybe you can get a better idea... An interrupt es an 'event' that happens inside the microcontroller, this 'event' is 'triggered' by internal or external means... (say a edge detected on an special input pin, or a timer overflow, or some communication event) this 'events' c
Setup is: MSP430F1101A internal DCO at wakeup then switch to external 4.096MHz crystal. AQ430 C compiler/IDE MSP-FET430UIF This processor keeps getting locked up. I've added all kinds of pin wiggles to watch whats happening, because it doesnt happen while connected to the debugger. As far as I can tell, it appears that a timer A inte
Those current requirements are quite easy, and your software can make a great saving too if well written. If your design requirements allow it, then the MCU can power down for most of the time, just powering up from an internal timer for the sensor read and transmit. Also, you might be able to turn off the sensor power supply if they have a quick s
Hi, Depending on the complexity of the rest of your program you can also use a couple of internal methods. timer1 can be used as a timebase to an internal interrupt driven rtc. Just add a 32khz crystal and caps to the timer1 pins, example Assembler code and circuitry in the 18F datasheets, timer1 (...)
You set bit 5 to 0. Then the timer increments using the internal instruction clock (Fosc/4) and prescaler value. If bit 5 is clear, bit 4 is ignored. T0CON = 0x82; /* timer 0 on, 16 bit timer, 1:8 prescaler */ The timer increments at Fosc/4, which in your case is 8/4 = 2MHz So you want a 1:2 (...)
Hi, I'd like to know if I can configure an internal timer of STM32L152 to generate a pulse after a td delay of an external and casual event. If it is possible, How Can I Configure the timer?
Hi, I am using dsPIC30f4011 microcontroller. I am trying to determine the internal clock of my microcontroller by using timers. void timer2Int() org 0x20{ RF0_bit = ~RF0_bit; IFS0 = IFS0 & 0xFFBF; } void initTMR2(void){ TMR2 = 0; T2CONbits.TON = 0; T2CONbits.TSIDL = 0; T2CONbits.TGATE = 0; T2CONbits.TCS = 0; T2CON
The 555 works by charging a capacitor, when it exceeds a certain voltage (~1/3 Vcc), the internal flipflop goes over. When the voltage on the capacitor exceeds another voltage (~ 2/3 Vcc), the flipflop is reset. If the capacitor was not discharges this is all that would happen - used in mono stable mode. The flipflop also makes the "discharge " pin