How to set 18F2520 for INT OSC?

[mackrackit]

_OSC_RCIO6_1H
Is not what you want
Try this
__CONFIG _CONFIG1H, _OSC_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H

Then in your code
DEFINE OSC ??
?? being the speed of your external

[circuitpro]

The datasheet for the PIC18F2520 shows "ECIO" for "external clock with IO on RA6, and the P18F2520.INC file in MPASM sort of modified that to "_OSC_ECIO6_1H", so that's what I used. Using "_OSC_HS_1H", works, but gives me the same 25 second wait at power-up. I'm not using a crystal, I'm using an external oscillator/clock.

[mackrackit]

What exactly are you using for a clock? Is it running?
What is the speed?
Do you have DEFINE OSC xx in your code?

[mackrackit]

Once it finally starts does it run correctly?

[circuitpro]

Yes, it does. Regarding the EC settings, I tried using "_OSC_EC_1H", and did verify that I was getting 5 MHz (1/4 freq), out on A6. I'll be glad when this "CONFIG WIZARD" is working.

[circuitpro]

I didn't see your other questions... I'm using an external 20 MHz oscillator., and "DEFINE OSC 20" is in my code. I didn't have any trouble setting EITHER HS or EC settings (wierd), but it's the power-up delay that's confusing. Don't see a reason for it.

[mackrackit]

HS should be it. OSC input on both OSC pins.

What about MCLR?
Is it pulled high?

Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, all time-outs will expire. Bringing
MCLR high will begin execution immediately
(Figure 4-5). This is useful for testing purposes or to
synchronize more than one PIC18FXXXX device
operating in parallel.