Beginner problems with 18F66J50

[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

[mackrackit]

The drawing also only has half of the OSC connected. But I am sure that is only on the drawing...

Why not try just for fun, setting the configs not with the programmers software but in the *.inc or code space?

The settings in the *.inc straight from the install for this chip should have you running with a 20 OSC.

Then
DEFINE OSC 48
Me thinks.

[prstein]

The drawing also only has half of the OSC connected. But I am sure that is only on the drawing...

Why not try just for fun, setting the configs not with the programmers software but in the *.inc or code space?

The settings in the *.inc straight from the install for this chip should have you running with a 20 OSC.

Then
DEFINE OSC 48
Me thinks.

Thanks for catching the error in the schematic, but as you surmised the resonator is indeed connected.

I don't alter the inc file because I have no luck figuring out what they should be, at least in this case. I'm happy to try most anything to get this to work...

I tried adding the define (and also several sets of configuration settings), with the same negative result.

Best Regards,
Paul

[prstein]

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

Thanks again, Robert. The ISCP is not providing Vdd for the board. Vdd comes from a 2.5V regulator. I verified with a 'scope that Vdd is not changing during programming. I can see the programming data coming in at 5V, but PORTB is 5.5V tolerant.

Best Regards,
Paul