PIC24F16Ka101 RA4 not functioning as digital output

[ponnus]

Hai,
I am trying to use RA4 pin of PIC24F16KA101 as digital output.It is connected to one of the segments of the 7-segment display. But it is always giving a constant voltage of about 800mv. I am not able to drive this pin.

I checked the datasheet to know if it is an open drain, but that is not mentioned in the datasheet. I also tried setting it as open drain (ODCAbits.ODA4 = 1), and used a pull up resistor of 10K to Vcc(Vcc=3V). But still unable to drive it.

Does anyone faced such a problem?Any help is appreciated.....

Thank you

 

[milan.rajik]

Set it as digital IO. If it is set as analog input then it will not work.

 

[ponnus]

Set it as digital IO. If it is set as analog input then it will not work.

Hai,
Thanks for the reply.

I have already set it as digital output using TRIS register, and this pin is not multiplexed with analog input. It is multiplexed with these ,PGC3/SOSCO/T1CK/U2CTS/CN0/RA4, but I am not using any of these peripherlals.

 

[milan.rajik]

Try configuring these registers.

CNPU1
CNPU2
CNPD1
CNPD2

ODCA.ODA4

Use LATA instead of PORTA (LATAbits.LATA4 instead of PORTAbits.RA4)

Zip and post your project files.

 

[ponnus]

Hai,

When I was unable to drive the pin just like other pins, I thought it is an open-drain output.
So, I tried using a 10k pull up resistor,but it didn't worked.

Then I've made it open drain by setting ODCAbits.ODA4 = 1; and enabled the internal pull up by setting the corresponding CNPUE1 bit, but still the same result.

I am using LAT register for outputting.

Still this pin is giving around 800mv.

Thank you