On Mon, 8 Nov 1999 17:46:08 -0500 John Gerthoffer writes: > Question: Does anyone know if the time delay between Vdd=+5 and > Programming > can be adjusted? I don't think there's a way. The PICSTART Plus wasn't designed for in-circuit programming, though it can certainly be used that way. What may help is supplying the PIC circuit with 5V all the time from an external source. This will also be essential if you have other devices on the 5V bus that use more current than the Picstart is willing to supply. Another major in-circuit programming issue is that MCLR rises from 0V to Vpp quickly enough that the PIC doesn't start running in normal mode (while Vpp is in the "logic high" voltage range) before entering programming mode. This time is given in terms of a number of oscillator cycles. When a PIC is in the Picstart socket, it's oscillator won't run, so the timing isn't critical. But in your circuit, the oscillator will start when 5V is applied. So if you're supplying 5V all the time it may be necessary to disable the oscillator. A crystal oscillator can be disabled by forcing X1 either high or low, only microamps of current will be required. Forcing it low is probably safer in case the PIC is configured for RC oscillator. ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.