DT Instant Interrupts - Clarification?

[Aussie Barry]

Yes, it was the GPOI.2 statement in the ISR that was causing the problem.
All fixed now

This is a Code Space Test

Hey, I even got the code space thing happening - I'm on fire!!!

Thanks for all your help guys - really appreciate it.
I will post details of the final project once it is all up and running - code, circuit diagram, PCB and some pretty pictures of the finished product.

Cheers
Barry

[retepsnikrep]

Just continuing on from this thread i have my own question about DT Interrupts for the 12F683.

Having looked at the example given by darrell for the generic timer the code below seems unecessary if we know what the values are for the prescaler etc?

;---[TMR1 reload - interrupt handler]-----------------------------------------
ASM ; Calculate Timer Reload Constant
ReloadInst = 8; # of Intructions used to reload timer
if ((Prescaler == 1)||(Prescaler == 2)||(Prescaler == 4)||(Prescaler == 8))
MaxCount = 65536 + (ReloadInst / Prescaler)
TimerReload = MaxCount - (OSC*1000000/4/Prescaler/Freq)
if ((TimerReload < 0) || (TimerReload > (65535-ReloadInst)))
error Invalid Timer Values - check "OSC", "Freq" and "Prescaler"
endif
else
error Invalid Prescaler
endif
ENDASM

Do we need this error checking if we know and are happy with osc/prescaler/freq etc or am i missing something else. It looks like it might take a fair bit of code space?

[mister_e]

That snip perform calculations at compilation time and doesn't take ANY codespace. 'course you can remove it. It's there for convenience and ease of use.