18F4431 - setting pins as plain IO

[atferrari]

Micro 18F4431 - Assembly

In spite of having used the above, several times in the past with no issues, today, after replacing in a working design, the 18F452 in charge with a 18F4431, I found the keyboard and LCD, not responding. After much RTFM, I noted that pins

RB0 / PWM0
RB1 / PWM1
RB2 / PWM2
RB3 / PWM3
RB4 / PWM5
RB5 / PWM4
RD5 / PWM4
RD6 / PWM6
RD7 / PWM7

may be assigned in various ways to the Power Control PWM Module. In my case I wanted all of them to behave as common IO pins. Basically, by doing CONFIG PWMPIN =OFF, they will start as such since power up.

But, if for any reason, I did CONFIG PWMPIN =ON, later, to get ALL of them released from the PWM peripheral after power up, I should do:

BCF PWMCON0,PWMEN0
BCF PWMCON0,PWMEN1
BCF PWMCON0,PWMEN2

The above allows several possible combinations (which I do not need by now).

I am not trying to teach anything to anyone! Just an expression of relief; duly noted in my data sheet, it is one ghost less to chase in the future.

 

[MaxHeadRoom78]

I guess you are referring to the pic manual showing PWMEN0,1,2, as =1 on POR?
Max.

 

[atferrari]

I guess you are referring to the pic manual showing PWMEN0,1,2, as =1 on POR?
Max.

Yes Max. From there I became aware of PWMPIN what led me to dive into the PWM module.

 

[Ian Rogers]

You need to override the pins.. OVDOND and OVDCONS Its in the datasheet! 17.10.3

 

[atferrari]

That's what I did Ian. It is in the OP.

 

[Ian Rogers]

That's what I did Ian. It is in the OP.

Where??

The override is so you can have PWM on some but normal IO on others....

 

[atferrari]

You need to override the pins.. OVDOND and OVDCONS Its in the datasheet! 17.10.3

Hola Ian,

I understood "override" as changing the settings of those pins to get them as common IO instead of PWM_dedicated. In my case, I made ALL of them as IO.

No hands on experience with those OVDOND / OVDCONS register but I think they alter what each pin outputs but they do no change to common IO ones.