PIC18F46K22 config issue

Hi folks,

Im trying to use a PIC18F46K22 for the first time, and am having a little trouble with the config for PORTD. I am using D.2 & D.3 as DEBUG pins, and D.5 as a LED indicator. The first thing I'm trying to do is turn off the LED by setting D.5 high. So far, so good. Then I try to send something out the DEBUG port D.2. The LED promptly turns right back on again.

The only PORT config I have is:

ASM
;PORT D
CLRF PORTD
MOVLW 00001000b ;SET PIN DIRECTIONS
MOVWF TRISD
ENDASM

and my DEBUG setup looks like this:

'DEBUG PORT
DEFINE DEBUG_REG PORTD 'DEBUG PINS ARE IN PORTD
DEFINE DEBUG_BIT 2 'TRANSMIT DEBUG PIN IS PORTD.2
DEFINE DEBUGIN_BIT 3 'RECEIVE DEBUG PIN IS PORTD.3
DEFINE DEBUG_BAUD 115200 'DEBUG PORT IS 115200 BAUD.
DEFINE DEBUG_MODE 0 'INVERTED OUTPUT

Can someone with more experience with these configs tell me why my DEBUG command might be interacting with my LED?

Thanks much,
Len

Hi,
Don't think it has anything to do with your CONFIG bits, it sounds more like a RMW issue to me. To verify if that's the case either insert a PAUSE between the setting the output and the DEBUG statement or control the LED by writing to LATD instead of PORTD.

/Henrik.

Datasheet Page 153 [10.7]