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# 8051 Clock 8051

165 Threads found on edaboard.com: 8051 Clock 8051

## Re: Adjustable/Resetable Digital Alarm Clock using 8051(89s52/89c52) in 7 segment dis

hi, hope you know 8051 is working in +5v. if you have 5V power supply u can give directly. In case you have 12V power supply use 7805 votage converter ic. The input of 7805 is 12V and output is 5V.

## Are there EMI problems with this Layout ?

Hello, could someone tell me if there is a EMI problem to expect with this 8051 circuit layout ? It runs at 6MHz clock and the buses should run at 500kHz. I messed the placing of the decoupling capacitor at the 8051 cpu, i think it should have been above the CPU and connected via a top layer strip to (...)

## I ms delay creating in 8051

hello Q=20Mhz MC=0,60?S if 8051 timer is similar to PIC timer you need to spend 1666 * 0,6 => 1 mS load the timer with 65535-1666=63869 .. TH0= 0xF9; //initial value for 1ms TL0 = 0x7D; 0xF97D => 63869 so seems to be OK if timer has no prescaler or potsscaler and use MC as clock.

## 8051 mode0 serial trans problem

hi, i am trying to use the mode 0 serial transmission mode of 8051 microcontroller but it is not working. what value of SCON register must be placed in order to use it? i have used scon = 0x00; is this correct? thanks

If you are using PIC or 8051 you can try these codes.

## why we divide 8051 timer by 12 ?

8051 machine cycle consists of 12 clock pulses so we divide the crystal frequency by 12 114452 This image explains the concept of instruction cycles and clock frequency

## Understanding a Delay, for(j=0;j<1275;j++);, Crystal freq & 1275, 8051

Complete confusion about instruction timing. Yes, a classical 8051 performs 1 instruction cycle per 12 clock cycles, resulting in e.g. 1 ?s instruction cycle with a 12 MHz crystal. But a single C code line is translated to many machine instructions, each of it taking one or two cycles. See below how Keil C translates the inner loop (...)

## 80c51 microcontroller questiond

hi, will at89c51 assembly code or c code work with intel 8051? are they same? thanks

## Measuring 50Hz signal using interrupt for relay operation

first of all thanks to all of you... i want the perfect value of signal at particular instant so if fault is occurs my 8051 can generate tripping signal. What kind of fault did you have in mind? What do you quantize as a fault? how much voltage, current frequency variation is expected? tolerated? Will you relay w

## 8051 interfacing with EEPROM 24c04 is not able to find the read and write data

#include sbit SCL = P2^2; /* connect to SCL pin (clock) */ sbit SDA = P2^1; /* connect to SDA pin (Data) */ void InitSerial(void) { SCON = 0x50; // setup serial port control TMOD = 0x20; // hardware (9600 BAUD @11.0592MHZ) TH1 = 0xFD; // TH1 TR1 = 1; // Timer 1 on } void Ser

## Clock Output of RTC(8563) interface with 89C52

RTC 8563 uses I2C and 8051 doesn't have hardware I2C. You have to write software I2C code and use it to read and write RTC.

## Problem related to digital clock in 16x2 LCD

I want to make a 8051 MCU based digital clock which will be shown on lcd 16x2. (JHD 162A). I want the assembly language program for that. I want the particular code that will circulate a loop in a particular LCD address. What will be the program? Please help me. Greetings, I do agree with him :- [QUOTE=themask;130976

## help me fix this code, please ( ASM )

You didn't specified the crystal value and the microcontroller you are using... But it seems MCS 51. So lets assume you have 12MHz clock with an old 8051... For 12 MHz, 12 Mhz/12= 1MHz (Effective clock to the core) ( 1 / 1MHz ) = 1us (minimum time for single execution) (65536-xx)*1us= 50 ms (50ms is the perfect round (...)

why 8051(at89s51) microcontroller read the signals when clock signal is low.

## 8051 clock input signal to L297/L298

You'll find a clear timing digram of "External Data Memory Write Cycle" in 89C51 hardware description. Data is put on P0 during nWR low, for about 6 clock cycles. But how do yout want to latch the data in the second 8051? It has no bus device interface or input capture feature. The idea simply doesn't work. You can of course set the (...)

## I2C interfacing with 8051

how do i write on a i2c bus as well as read data from a I2C. i want to read and write data from the ds1307 ic. and i want to know how do i code it in c to interface it. See some examples: Real Time clock Interfacing (DS1307) with AT89S51

## 8051 timer not working

Hi, Iam using ESA51E board, having 80C51BH Ucontroller forn intel. In my code iam trying to Implement real time clock using timer When i check for register values in Win51E they wont get updated, while other values does...(like PC, DPTR...etc). im also using 8255 The change of values takes place in ISR, which is not happening. Interrpt is nt ge

## need logic for read 24 bit on evry falling edge of clk pin

C doesn't explicitly handle bit arrays, but you can still implement something that LOOKS like a bit array using char or int arrays. There are numerous examples out in internetland. And what do you mean read on every falling edge? Do you mean your clock edge? If that's the case, you're out of luck because an 8051, if I remember correctly, (...)

## HOW TO PROGRAM IN MikroC for 8x8 LED MATRIX

this is my clock project using 8051 just change the ic and get an led matrix just changing the IC won't do the job you need to write code for 16f877A

## [Moved] RC oscillator as clock source for 8051...

It's been a long time, but I believe the 8051 needs either a crystal or an external oscillator, you can't use an RC like the PIC. But you can make a pretty inexpensive oscillator from an inverter, cap and resistor.

## digital clock using 8051???

Here are 3 ways to make a clock using a C8051: 1.) Use a 8051 and a 1 line LCD display. The LCD connects to the 8051 using the SPI or I2C bus This is the most expensive and it can be hard to connect to the LCD without a PCB 2.) Use 4 7 segment displays connected to (...)

## 8051 asm digital clock

Dear all my friends i make a digital 7 segment clock without rtc only timer0 ..... i can count the seconds minutes hours with no problem .... but this values is binary how can i display this values .... only hours and minutes at the display ... please help My program by assembly best regards MedTronic

## alarm clock using pic 16f877 rtc and pc keyboard

Ok lets start it right from beginning. so which Micro-controller you are familiar with? is it pic,8051 or else?

## hi all i have an importance project can you help me

Give me 1 day time and I will give you the code. Mention which PIC/AVR/8051 MCU you want to use and what clock frequency you use?

## 8051 timer interrupt for generating 500 KHz

I said "the only feasible way" with a reason. It's impossible to run 8051 interrupts at 500 kHz. 50 kHz will be demanding yet.

## microcontroller question..

11.0592MHz ... ? because of more accurate baud rates in 8051 series! If use 12MHz then baudrate clock have much bigger baudrate errors! - - - Updated - - - A1: 11.0592 MHz crystals are often used because it can be divided to give you exact clock rates for most of the common baud rates for the UART,

## Interfacing of RTC DS1307 with 8051 using i2c with time and date setting options

Hi friends, Am posting the code this code am getting a problem that clock runs quickly without going accordingly with our real time clock please help me out please..... Thanks in advance #include sbit set=P1^2; sbit mov=P1^3; sbit inc=P1^4; sbit dec=P3^7; sbit ent=P3^6; void all_disp(); void time_set(); #define

## can i generate 50Khz clock pulse using 8051 micro controller??

i have a circuit where i should give a clock pulse of 50Khz to a switch can i use 8051uc??

## serial transmission in 8051

hi everybody i having a small doubt, i had interfaced the several clocks with one master clock, all the clocks are have to run in a same time in synchronize manner. but in these what is the problem means, while im moving slave clock to long range approximately(100m), then the slave clock getting slow (...)

## problem while interfacing the ds1307 for EEPROM memory

You coding error... here I have tested this one, it works except for the am/pm display on LCD... Best Regards, waqas

## [MOVED] 8051 generating two square waves simultaneously

I need to generate 10khz and 1khz square waces at P1.0 and P1.4 simultaneously clock = 1MHz Am i on the right track? 1/10k = 100us -> timer0 mode2 1/1k = 1000us -> timer1 mode1 mov tmod, #12H; setting up timers mov th0, #0CEH; -50cycles for timer 0 mode 2 setb tr0; start timer 0 setb tr1; start timer 1 mov ie,#8AH; setting interrupt ena

## 8051 real Time Clock

just consider how to buil real time clock using my 8051 without RTC device such as DS1307, etc.. Is it possible? Thank you.. mentoz

## 8051 digital clock not working

hi, i am trying to make the 8051 digital clock but the leds are not blinking someone plzzz............ suggest me what should i do:sad:

## Digital Clock using 8051 and mikroC code.

Dear All; I need 8051 mikroC code for Digital clock. Kindly help me in this regard. I shall be greatful. thanks Tanvir

## help needed interfacing RTC DS1307 with 8051

It's not clear why you need to add multiples of 6. If you type DS1307 in the search box, it reveals 450 results, so it's highly likely at least one of them will help you with this device. There is also this URL which shows in some extreme detail how to use the DS1307. The microcontroller used was an

## [Moved] A temperature clock display module made in holidays

This is a temperature clock display module made during holidays: 79812 79813 This is a 16*16 matrx display module: 79815 My table: 79816 79817 System core: 8051 MCU(STC, nice for begginers, not for indust

## Can somebody write this code in mikroC format?

Hello! I want this code to be written in mikroC PRO 8051. Please help. sbit clk=P1^7; // clock void timer0() interrupt 1 // Function to generate clock of frequency 500KHZ using Timer 0 interrupt. { clk=~clk; } TMOD=0x02; //timer0 setting for generating clock of 500KHz using interrupt (...)

## Digital Clock using 89s52/89c52

Hi guys, here is a simple project I have done in 89s52 IC of 8051 series. Making a Digital clock. Components required: 1 microcontroller 89C52(89S52 will also do) 2 ceramic capacitors-22pF 1 switch(button for reset purpose) 1 electrolytic capacitor-10uF,25V 1 crystal oscillator-11.0592MHz 16x2 LCD display 1 resistor-10k (...)

Examples : Yo

## Trouble with 8051 uart

as I say in topic #3 ports aren't configured as output! see your datasheet and download keil c development tool at (free to 2k code) ps your datasheet: see page 30 5. GPIO PxM1.y PxM0.y Port output mode 0 0 Quasi-bidi

## Digital LED / LCD clock using 89v51RD2

yes, why not ? if you cant get it exactly for your search term 89v51RD2. try searching for 8051 instead , That's the family name for your micro-controller. ---------- Post added at 05:50 ---------- Previous post was at 05:47 ----------

## digital clock for 8051 using dot matrix

Please can someone provide me with proteus design and assembly code for digital clock using dot matrix. It's required for our project submission.

## Relating 8051 Programming

sir i want to make a propeller clock can anyone tell me about the idea of circuit n programming of the micro controller ic 8051 in c language.

## project of micro controller

Interface LCD with 8051 and display the name on the LCD this is the basic one then try to implement the Digital clock with the help of 8051. create a delay of 1 sec and then increment it.

## require source code of PROPELLER Display

can any provide me report for PROPELLER clock Display using 8051..........!!!!!!!! mail me at yogeshkothiya05@gmail.com. thnx in advance!!!!!!!!;-):lol:

## problem programing AVR with USBASP !!

I have developed a USBASP based on: USB 8051/AVR programmer - Free 8051 Microcontroller projects Microcontroller Projects: USB 8051 (89 series) & AVR Microcontroller