Hi, Further to this - the release notes for MPSIM state that timer 1 on the 12f675 doesn't work but that seems to work fine for me - its the ADC the you can't seem to set the GO bit (ADCON0<1>) for... Nick -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu