High-Z Analog drive mode w/o input buffer - GPIO configuration for PSoC4000S

[EmJay]

PSoC4000 has two GPIO register to set the Port-Configuration (Drive-Mode): GPIO_PRTx_PC and GPIO_PRTx_PC2.

GPIO_PRTx_PC specifies the Drive-Mode of a Pin, and GPIO_PRTx_PC2 is used to explictitly disable the input Buffer for a Pin.

In PSoC4000S TRM it is descibed, that using Drive-Mode 'Analog' in register GPIO_PRTx_PC automatically disables the input buffer.

When I checked the API Code for initializing CapSense Pins, I noticed that Drive-Mode was set to 'Analog' in PC-Register and additionally the input-buffer was disabled in Register PC2-Register.

My Question: Is there a difference in analog characteristics depending on PC2 setting for Drive-Mode-Analog?

Thank you.

[rahulrajsharma · Accepted solution]

There's no difference, but if you keep the input buffer enabled with an analog signal on the pin then the current consumption of the device will increase.

[EmJay]

That's what i expected, but I want to make certain.

I just wondered about the API code, where the input buffer is disabled twice.

Thank you for your reply !