TMR0 interupt bit

[jmgelba]

Ok, added the option_reg to set up the counter to count ra4, low to high, WDT with a 1:1 prescale.
Removed the count = display. Display should now increment? I can then use the value in display and send it out to the digits?

What I was trying to do there was have display = count so that display would continue being incremented and I could do all the math and segment work with count word. This is becuase I need to count 21600 interupts, and them send that out as a 1 to the 7 segments. Sort of like a custom interupt postscaler I guess.

Thanks for your help and insight everyone. Dave I already owe you one!

display var word


OPTION_REG = %11101000
INTCON = %10100000

display = 0 ' set initial value of counter display (This should appear on the 7 seg displays.)
TMR0 = $00 ' set timer value to 0
on interrupt goto setdisplay

disable
setdisplay:
display = display + 1

INTCON.2 = 0 ' clear overflow flag
TMR0 = $00 ' reload TMR0
resume
enable

[jmgelba]

I think a light just came on!!

Am I correct in thinking that you cant directly assign a word to the overflow flag, but when it interupts, your word can be embedded in the subroutine that you run on interupt? So the above code example would prove this by now having the display word being incremented whenever the timer overflows and provides the interupt.
Its all semantics!!

[Dwayne]

Hello JM,

Jm>> So the above code example would prove this by now having the display word being incremented whenever the timer overflows and provides the interupt.<<

That is correct...


Dwayne

[jmgelba]

DEFINE OSC 10

OPTION_REG = %11101000
INTCON = %10100000

Display var word


TMR0 = $00 ' set timer value to 0
on interrupt goto setdisplay


disable
setdisplay:
display = display + 1
write 100,display
INTCON.2 = 0 ' clear overflow flag
TMR0 = $00 ' reload TMR0
resume
enable

This will increment the value in location 5 which is great. However, when I add this line........


data @0,192,249,164,176,153,146,130,248,128,144 ' 0-9 segment data


.....location 100 will no longer store any value. What am I missing?

[jmgelba]

Any thoughts on this?