ISR pushes and pops from the stack ST1_55.
Need to set flag in ISR routine and toggle after return.
Martin
using ST1_55 bit 13 (0x2000) and (0xdfff).
is there a problem using ST1_55 bit 13 after a timer expiring.
My code works when called from main using a for(......) to determine the cycle time. When called after timer expiration
from the interrupt it does not word. The timer cycle is about 3 seconds.
Thanks
Martin