On Thu, Jul 28, 2005 at 08:17:06AM -0700, Herman Aalderink wrote: > Wouter, > What is the underlying problem here? > Is it the program (in the target PIC) that will start-up before > programming (before MCLR to 13V) ? No. The programming specification for the part specifies that both Vdd and MCLR start at 0V. See figure 2-2 in the programming specification here: http://ww1.microchip.com/downloads/en/DeviceDoc/41196e.pdf > Assuming I got that right, would prior erasing or disabling the > oscillator solve the problem? Nope. To properly program the part Vdd should start from 0V. Wouter's pointing out that in order to meet the specification Target power needs to be able to be turned off. BAJ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist