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To keep very accurate timing during ACTIVE and IDLE modes I would like to push the core into IDLE mode and pull it out within Timer0. When I try to do this the system hangs. If I simply set a flag and have the main loop set PCON.IDLE it works fine. It is written in assembler and I am checking the push/pop stuff. I think the problem is in RETI. What happens to the hardware with RETI? Any help or pointers would be great.
Thanks for the quick reply. I am suffering through conflicting requirements. My device must maintain very low power consumption and support FHSS on a single timer. The other timers are allocated for other uses. My plan is to have the synchronous FHSS run completely via timer0. This means I must enter and exit IDLE mode in this timer or have a very tight main loop to deal with the entry. This not a good plan because the main loop can not really do anything now or in the furture. If I can find out what RETI does maybe I can tweak the write stuff before I enter IDLE.