> can this interrupt flag be set and preserved during sleep mode (with > interrupts disabled) ??? Hi Stef, F88 manual, 15.13.1 "Wake-up occurs regardless of the state of the GIE bit". That section seems to focus on needing to wake from SLEEP, rather than not wake "When GIE is cleared and any interrupt source has both its IE bit and IF set..... ......If the interrupt occurs after a SLEEP instruction the device will immediately wake from SLEEP" You know, it would be quicker and tell you for certain by just programming a chip ;-) Looking at Figure 15-7, Interrupt Logic, my guess would be that the IF would be set Interesting question though -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist