20x2 timer function similar to one on 14m2

[alhoop]

I use the code below on a Picaxe 14M2 to count seconds between switch closures. Time can vary fron 1 to 22 seconds.
Will loop around keeponw until pinc.2 goes true.
Can this be done on the Picaxe 20X2 and if so how?
Thanks
Al

Start:
setfreq m4
pulsout b.3,10  ;reset
if pinc.1 = 1 then east
if pinc.2 = 0 then start
time = 0
let b0 = time
keeponw:
if pinc.1 = 0 then keeponw
let b1 = time
b1 = b1 - b0
readtable b1,b4
goto calc

 

[inglewoodpete]

Yes. The X2 series have an enhanced capability when compared to the M2 series. Firstly, would a 20M2 do what you want?

For the 20X2, you would add the SetTimer command in your initialisation code. X2 chips have a variable 'tick' length that must be configured. You would need to use the internal timer. The default speed of the 20X2 is 8MHz: if using that speed you would use the t1s_8 parameter, which makes configuration easy.

 

[rossko57]

This thread gives descriptive help with X2 timer use
http://www.picaxeforum.co.uk/showthread.php?23285-Timer-Tangles-Resetting-the-TOFlag-for-X2-Interrupts

It should be easy to set up the interrupt routine to increment a faux M2-style "Timer" variable at 1 second intervals, and drop into existing code.