Kyle

I assume that you are using the EEPROM programming algorithm with the C84?

Robin Abbott - robin.abbott@fored.co.uk

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----- Original Message -----
From: Kyle Stemen <arkia@COLUMBUS.RR.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 22 November 1999 23:59
Subject: Problems with custom made programmer


> 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