Post by thread:PIC 16C64 Problem

Hi everybody, I am currently having a problem with a PIC 16C64, so Jaap van Ganswijk gave me the idea of posting it to this list... I already have some expirience with PIC 16C5x devices, but for this particular application (a RS232 control pannel), I needed some more I/O pins. So I chose the '64. I am using a Parallax PIC16Cxx programmer and a homemade 40 pin ZIF adapter for the '64. The adapter seems to work ok, since I am able te write, read and verrify the PIC. I use PASMX as assembler. But the PIC wont do a thing... even if all i try is putting a byte on one of the I/O ports... I did notice a lot has changed on this edition of the pic... (no more MOV !RA,#?? instruction, the realocation of the reset vector, and the addition of a a GND and VCC pin) (Why does the pic needs 2 power pins ? do I have to connect them both??) I try'd to run the device (a JW version) on a 20 MHz osscilator, and on a 4 MHz ceramic resonator. But it just sits there and does nothing... I do not know if my problem is soft- or hardware-related, since I was unable to get any (known working) source code examples, written in parallax assembler, for the PIC16c64. Any tips are more then welcome, as is a source example or simple hardware schematic. Greetings, Hans. ON1DFE

On Tuesday, October 17, 1995 2:38 PM, Hans Ameel [SMTP:spam_OUTHans.AmeelTakeThisOuTPING.BE] wrote: {Quote hidden}> Hi everybody, > > I am currently having a problem with a PIC 16C64, > so Jaap van Ganswijk gave me the idea of posting > it to this list... > > I already have some expirience with PIC 16C5x devices, > but for this particular application (a RS232 control > pannel), I needed some more I/O pins. So I chose the '64. > > I am using a Parallax PIC16Cxx programmer and a homemade > 40 pin ZIF adapter for the '64. > The adapter seems to work ok, since I am able te write, > read and verrify the PIC. I use PASMX as assembler. > > But the PIC wont do a thing... even if all i try is > putting a byte on one of the I/O ports... > > I did notice a lot has changed on this edition of > the pic... (no more MOV !RA,#?? instruction, the realocation > of the reset vector, and the addition of a a GND and VCC pin) > (Why does the pic needs 2 power pins ? do I have to connect > them both??) It wouldn't surprise me if you need to connect both power and ground pins. I had a 68HC11 project where I used a pin that had multiple power and ground pins. I forgot to connect one of the power pins and it took me a long time to figure out why I couldn't read from the on-board A/D. Then I hooked up that extra power pin and voila, A/D worked fine. --Anil