Beginner problems with 18F66J50

[prstein]

I'm trying to move beyond my comfort zone chips, the 16F877 and the 18F452, and expand my horizons. So far it is kicking my tail and making me feel like a total n00b. 8^(

All I'm trying to do is make a pin (any pin!) alternate between high and low. Not even trying to blink an LED, I'm using an oscilloscope. (Blinky will be the next step...)

I'm using an MELabs Pic Proto80 board with a 2.5V regulator. I'm programming through the PP80's ISCP using an MEL U2 programmer. It appears to be taking the code but nothing whatsoever happens on any of the pins.

My code is below, and I've attached the schematic and a screenshot of the programmer configuration. I'm at a total loss and I would truly appreciate any helpful guidance in this matter.

define OSC 20

INCLUDE "ALLDIGITAL.pbp"

TRISA = 0
TRISB = 0
TRISC = 0
TRISD = 0
TRISE = 0
TRISF = 0

MainLoop:
	PORTA = 1
	PORTB = 1
	PORTC = 1
	PORTD = 1
	PORTE = 1
	PORTF = 1
	pause 100
	
	PORTA = 0
	PORTB = 0
	PORTC = 0
	PORTD = 0
	PORTE = 0
	PORTF = 0
	pause 100
goto mainloop

Thanks for reading,
Paul

[Bruce]

Have you tried it with extended instruction set disabled?

[prstein]

Have you tried it with extended instruction set disabled?

I just tried that, still no joy. Thank you, though.

Best Regards,
Paul

[rsocor01]

Have you tried a different "Oscillator Selection"?

Robert

[prstein]

Have you tried a different "Oscillator Selection"?

Robert

I've now gone and tried all of them again, this time with extended instruction set disabled. No luck. Thanks for trying.

Best Regards,
Paul

[rsocor01]

I've now gone and tried all of them again, this time with extended instruction set disabled. No luck. Thanks for trying.

Best Regards,
Paul

I also see that you don't have a diode in MCRL protecting Vdd from Vpp. From the PIC datasheet, the maximum absolute value that Vdd can take is around 4.5 V. If the programming voltage, Vpp, is greater than 4.5V you might have damaged the PIC by no using a diode.

I don't see anything else that might be causing problems.

Robert