Mike Hord wrote: > In the case of Vdd-before-Vpp programming, it is possible that some > code could begin executing before application of Vpp puts the chip > into programming mode. No, not if done right. The maximum rise time spec on Vpp guarantees that no code will execute. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist