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.
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.
