I'm having some kind of problem getting the hspll mode to work on a PIC18F4620. Checking with a scope on a pin being toggled shows operation 4 times too slow .... looks like the pll is not on. The 10MHz crystal is in fact working at 10MHz. Yes, I know about power cycling. Here's what the assembly listing shows: 00037 ; __CONFIG _CONFIG1H, _OSC_HS_1H & _OSCS_OFF_1H 300000 F2FF 00038 __CONFIG _CONFIG1H, _OSC_HS_1H & _OSC_HSPLL_1H The F2 remains the same for either of the two config lines above. The correct value for "pll on" is F6 (the next FF shown is for the next config line, not related to the pll) So I'm doing something exceptionally stupid or the assembler is having fun at my expense... any ideas??? Thanks! MD -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist