Troubled Clock
I'm having certain 'strange' errors in my digital clock.
Processor = 16F84A @ 4 Mhz
4 inch , 12 volt LED Display
The schematic is almost the same as the one in the previous post.
(A battery backup has been added)
Problem 1:-
The clock sometimes just 'hangs'. I think the oscillator stops or something.
The display goes blank or most of the time only one digit on . . .
Problem 2:-
Timer0 is used for timekeeping (Darrel Taylor's Instant Interrupts).
The clock suddenly stops incrementing time.
i.e. the display multiplex routine keeps working as it can be seen that the all the digits on the display are displaying time.
The thing is that the time never increments.
I have programmed the colon between the digits to blink at 0.5 Hz.
This blinking is controller by the time keeping registers mid byte which is kept updated by timer0.
Since the digits keep showing a frozen time, and the colon stops blinking,
Could it be that timer0 has somehow accidentally been disabled ? ? ?
Attached Files :-
clock.pbp - main file
TMR0_int(ASM).pbp - interrupt handler
Could someone please help me out ?
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