Olympic Timer

[Melanie]

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[micro]

hello Melanie

i have some questions

1- i did not understand yet why did you used calibration? and what is that for ? all what i understood it that
you used to speed up or down, but i could not understand it why ?
2- all i know, the Disable i use it before interrupt routine and Enable after it, but i note you used it at different place
why did you placed at these places ?

Enable

DisplayLoop:
if ButStart=0 then runningflag=1
if butstop=0 then runningflag=0
lcdout $fe,$80,Dec2 hours,":", dec2 Minutes,":", dec2 seconds,":",dec2 Hundredths


if overflowerror=1 then
if seconds.0=1 then
lcdout $fe,$8c,"ERR"
else
lcdout $fe,$8c," "
endif
endif
if runningflag=1 then goto Displayloop
if butreset=1 then goto Displayloop



Disable

[Melanie]

Calibration

With the best intentions in the world, a 4MHz Clock is NOT a 4MHz clock. It is a few Hz fast, or a few Hz slow, but is is NOT exactly 4000000.0000Hz. so the Calibration feature is used to speed-up or slow-down the clock slightly to compensate, and to compensate any lag in software instructions used to service the interrupt.

Interrupt ENABLE

I only ENABLE interrupts where they are needed. In other places they are either not needed, or not wanted. This also makes for smaller and more efficient code.

[micro]

so put some codes between Disable and Enable, that will delay interrupt
handler rountine for few times?? and use that trick if i want to finish some
procedures, i fear if without it the interrupt could screw it up ?then for that i give some
delay to interrupt to finish that procedure?


Disable

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