It was insufficient bypass capacitance on the PIC.  Evidently, there was
additional capacitance inside the emulator.  Power is supplied by a buy-out
brick used by the client to meet CE regulations that is particularly noisy.
The POR was randomly triggered shortly after normal operation began and the
PIC restarted.  I could tell it was timer, but thought it was an error in
software.  Tore everything down to the simplest code possible and it was
still there ... Hmmmm

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Ed Browne
Sent: Thursday, March 25, 2004 2:13 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC:] emulator behavior


I've got a program running on an 16F877 that uses PORTC as a UART, for SPI
and as a digital output. With the emulator, all these coexist just fine,
however, when I program the chip and run independently it looks like PORTC
is misbehaving.  I haven't sorted it all out yet, but it looks like the
digital output is either tri-stating or switching to an input.  Anyone
experienced this before; i.e., the emulator running the code behaving
significantly different than the programmed code?

Thanks,
Ed Browne
Precision Electronic Solutions

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu