PORTA Logic - Be the processor

[Bruce]

Here's the link to Microchips flash training modules; http://techtrain.microchip.com/x14/

[Darrel Taylor]

Those are pretty interesting.
Gives me a few ideas too.

[MitchStipp2]

Your game was fun, I got a 109 (better hit the books again)

I have been migrating an application from a 16F887 to a 18F4420. After some debug (few hardware issues - oops!) the two output ports are doing great (B & D). Thanks to you Darrel my Timer 01 interupt is clicking away. I was able to change the config1h register to use the 4x PLL oscillator. But I am having trouble getting my input ports (A & E ) to function (very ashamed )
Oddly enough, there is one bit of the A port that works (bit 4). The rest of inputs on port A and E ignore me. Hardware check of pins show normal (pulled to Vdd via resistor with contact closure dragging them to Vss when applied)

Below is the I/O setup from my program:
================================================== ======
' ~~~~~~~~~~~~~~~~~~~ Define A I/O Port and Define Analog I/O ~~~~~~~~~~~~~~~~~~~
PORTA = %00000000 ' clearing bits as recommended in data sheet
ADCON0 = %00000000 ' turn off all A/D
ADCON1 = %00000111 ' turn off all A/D I/O points - make digital
TRISA = %00111111 ' bits 0-5 declared as inputs

' ~~~~~~~~~~~~~~~~~~~ Define B I/O Port ~~~~~~~~~~~~~~~~~~~
TRISB = %00000000 ' bits 0 declared as output


' ~~~~~~~~~~~~~~~~~~~ Define C I/O Port ~~~~~~~~~~~~~~~~~~~
PORTC = %00000000 ' clearing bits as recommended in data sheet
TRISC = %11110000 ' bits 4,5,6,7 defined as inputs
; LATC = %00000000 ' bits 0,1,2,3 declared as output

' ~~~~~~~~~~~~~~~~~~~ Define D I/O Port ~~~~~~~~~~~~~~~~~~~
TRISD = %00000000 ' bits 0-7 declared as output
; LATD = %00000000

' ~~~~~~~~~~~~~~~~~~~ Define E I/O Port ~~~~~~~~~~~~~~~~~~~
PORTE = %00000000 ' clearing bits as recommended in data sheet
TRISE = %00000111 ' bits 0,1,2 declared as inputs
' bits 3-7 declared as output
' to prototype Application inputs
================================================== ======

Does this look as you would expect? Got any other areas you would recommend I check - I think I am close to being able to recite the 18FXX2 data sheet, but it doesn't mean I might be overlooking something.

[Bruce]

Try ADCON1 = %00001111. Deduct 1 point from your score...;o}

[MitchStipp2]

Wow Bruce you are correct! But did I miss an errata sheet or is my trouble reading the table in the attached document
---------------------------------------------------------------------------
In any event I am back in the running. I owe you for this. You can take five of my points and add to your score.

Thanks again

[Bruce]

I'm not sure what to tell you about the MS Word DOC, but here's what's in the 18F4420
datasheet.

[MitchStipp2]

I think I figured it out Bruce

You provided data from Publication - DS39631E
=============================
PIC18F2420/2520/4420/4520
Data Sheet
28/40/44-Pin Enhanced Flash
Microcontrollers with 10-Bit A/D
and nanoWatt Technology
=============================

I was reading from publication - DS39564C (appears an earlier pub)
=================================
PIC18FXX2
Data Sheet
High-Performance, Enhanced Flash
Microcontrollers with 10-Bit A/D
=================================

I don't remember how I got the one I was using, but it is WRONG
concerning the ADCON1 register. I will be ceremonially disposing of the
incorrect publication this evening, it is sure to be festive event.

Once again "garbage in, garbage out".

Thanks again