Darryl, it sounds like you inadvertantly code protected the device.
     If this is the case, the part is destined for the dust bin.

     Rgds, Brian.


______________________________ Reply Separator _________________________________
Subject: UV Pic problem
Author:  Darryl Masters <darryl@BENDIX.DEMON.CO.UK> at Internet_Exchange
Date:    12/3/96 3:12 PM


Dear All

I am currently developing a PIC16C63 application. I am using a UV erasable
part in the development phase. My problem is that my device will no longer
erase after only 3 erase cycles. All the data appears to be 0.

- Could this be a result of leaving the device to 'cook' for too long
  in the eraser ?

- Should I expect this from microchip devices ?

As these devices are costing 25 pounds each, any ideas very welcome.

I do have one other problem with this device. I am using the UART and am unable
to clear the receive interrupt. I thought that reading the received data would
clear the interrupt flag.

In a test program I have the PIC connected to a terminal and on receiving a
character from it it is echoed back. The receive works from an interrupt.
After sending only one character it is continually echoed back to the
terminal. I therefore assume that the interrupt is not getting cleared.

Again any pointers gratefully taken.

Thanks

- Darryl