piclist 1999\11\22\160516a >
Thread: Problems with custom made programmer
www.piclist.com/techref/microchip/devprogs.htm?key=programmer
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face BY : Kyle Stemen email (remove spam text)



I am trying to make my own programmer for the PIC16CXX series. I have
gotten to
successfully work with the PIC16C74A, but it does not work at all with
the PIC16C64. My
programmer interfaces through the parallel port. My VPP is very close to
13 volts.

What could the problem be? All of my timing is extra slow. Is there a
limit to how long I can
wait? The specifications do not mention any limit. Does VPP have to
first stay around 5V
before it goes up to 13V? What kind of voltages are needed for a logic 1
and 0 on the data
and clock lines? When the PIC is outputting data how much current can it
sink or source? Is it
ok if I keep the power on most of the time, even when VPP is not on?
What differences could
the be for programming between the PIC16C64 and the PIC16C74A? I have
checked both chips
with the official programmer and they both work

<3839D8EF.D4CF9A17@columbus.rr.com> 7bit

See also: www.piclist.com/techref/microchip/devprogs.htm?key=programmer

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