8051 digital clock by 7-segment !! help

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7 segment clock

Hi , i have make a digital clock by using avr microcontroller , but the idea is the same.
you need to be familiar with interrupts because it simplify software design and lessen the load to the cpu , you need 2 interrupts in your program:
1-timer 2 interrupt , TR2 should be overflow each 50 ms(50000 us if using 12 MHz crystal) ,thus ,in your isr you need to increment seconds each 20 overflows ( 20 * 50 = 1sec) , and if seconds reached 60 you should clear it and increment minutes and so on.
2- TR0 interrupt for refreshing the display
 

hi!
I would like to share a tutorial on **broken link removed**
hope this might be useful
 

in assembler pls not in C
 

so many useful things here./.......if still anybody has completed it.
plz send it to me at:
ahmed_rohaan@yahoo.com

---------- Post added at 10:35 ---------- Previous post was at 10:35 ----------

any schematics,code..anythng is welcome..thnX
 

Hi
use a RTC and a microcontroller. If you like this idea i will make some circuit.
 

Re: 7 segment interfacing with 8051

plz need ur help urgently


i need assembly keil codes not of c for the 2 or 3 multiplexed 7 segment display with the use of microcontroller 89c51 or 89c52
 

Re: digital clock using 8051

you can use an RTC and interface it with the 8051 micro-controller.....the RTC IC is powered by a separate 3.3V Li-battery and will update the date and time even when the 8051 is switched off....u can make the 8051 read the value of the RTC registers,convert it into its corresponding 7-segment code and then display it....
you need to be very careful while writing the rtc code.....you must initialize the rtc only once after power up...
 

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