Nigel Orr Asked:

>At 22:04 30/08/98 -0400, you wrote:
>>that the pins adjacent to Vdd (Pin 10, RE2 and Pin 33 RB0) were at about 3
>>Volts.  This wasn't high enough, or have enough current to set off my logic
>>probe or be detected by my DMM, but it seemed to be holding the chip reset.
>
>Had you set these pins as outputs?  Added pullup or pulldown resistors?
>That might solve your problem if it is possible to do so.  If an input pin
>is left floating, and the impedance is high, it doesn't take much leakage
>to give strange inputs (I learnt the hard way, spending a long time
>debugging strange signals until I realised they correlated with a local MW
>station broadcasting from about 1/2 mile away...)

RE2 is going to be an input in the application while RB0 is set to an output
by the application.  Now, the problem was, that the application never
started, so RB0 could never be set to an output.

I've done this before with Weldbond with other PICMicros (take a look at the
Project pictures in "Programming and Customizing the PIC Microcontroller");
this was the first time with a 16C64A.  Does anybody have any ideas about
why this one would be more sensitive to this?


I also wanted to thank everyone for their suggestions and ideas.  It was a
lot more than I was expecting!

myke

Check out the "Handbook of Microcontrollers" as a reference for embedded
microcontrollers including information on the Intel 8051, Motorola 68HC05,
Microchip PICMicro, Atmel AVR and Parallax Basic Stamp:

http://www.myke.com/#MCUHand


Hunter S. Thompson's quest for the American Dream, this week in the Book Room.

http://www.myke.com/Book_Room/book1a.htm