PIC16F1703 microcontroller - input pins always reads 0

[JoeP]

Datasheet: http://www.farnell.com/datasheets/2137994.pdf?_ga=2.11177268.1643568016.1539016190-2008006305.1520009189

The input pins of my microcontroller seems to always be 0, regardless of the input voltage. Here is my code:

Code: [Select]

#pragma config FOSC = INTOSC
#include <xc.h>

void main()
{
    OPTION_REG = 0b00000011;
    OSCCON = 0b01111010;
    TRISC = 0x00;
    PORTC = 0x00;
    TRISA = 0xFF;
    while(1)
    {
    CLRWDT();
    if(PORTAbits.RA4)
        PORTC = 0xFF;
    else
        PORTC = 0x00;
    }
   
}The LED on port C remains off, whether I connect the RA4 pin to the ground or VDD. However, using RA5 instead does work. What could be causing this? Let me know if there are any tests I should try.

[MarkF]

It appears to me that all the pins that have ADC capabilities are set as analog input by default.  Set register A to be all digital inputs (i.e. ANSELA=0).

[Bruce Abbott]

1.1.6 ANALOG CONTROL
The ANSELA register (Register 11-4) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELA bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.

REGISTER 11-4: ANSELA: PORTA ANALOG SELECT REGISTER
U-0 U-0 U-0 R/W-1/1 U-0 R/W-1/1 R/W-1/1 R/W-1/1

Analog inputs are enabled at power on and reset. To digital read RA4 you have to set ANSA4 low.
 

[JoeP]

Excellent, it's working now, thanks.