Problem with PIC18F45K50's ANSELE register

Question

I am trying to make code for PIC18F45K50. I am trying to use PORTE as digital input. That means I have to clear the ANSELE register which controls this pin behavior.

Working on MPLAB X 3.30, I tried this line of code to clear the register:

clrf ANSELE

I also tried setting the bits of the register individually, but when testing in the MPLAB X debugger, no matter what I did, the instruction just didn't do anything and the code went on. How can I enable this register to be modified in MPLAB X?

The code I'm working on is made in assembly language.

Try to elaborate what you're trying to do, I mean what do you expect that the code does, also add your implementation. — Kozmotronik
– Kozmotronik, Commented May 21, 2023 at 8:20
Your MPLABx is pretty old. It' not the issue, but maybe update to v5.3. And please show more code. — Mike
– Mike, Commented May 22, 2023 at 7:17

Peter Mortensen · Accepted Answer · 2025-08-20 23:26:47Z

3

ANSELE has address 0x0F5F, so it isn't directly addressable, because it is not part of accessing RAM.

Check the datasheet for PIC18(L)F2X/45K50, FIGURE 6-5: DATA MEMORY MAP FOR PIC18(L)F2X/45K50 DEVICES for more information.

First load the proper BSR value to access these registers, like:

   MOVLB   high ANSELE
   CLRF    ANSELE

Or use an MPLAB assembler directive like...

   BANKSEL ANSELE
   CLRF    ANSELE

edited Aug 20 at 23:26

Peter Mortensen

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answered May 21, 2023 at 22:20

GJ.

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