Intel E3845 FH8065301487715 Data Sheet

 

Intel

®

 Atom™ Processor E3800 Product Family

Datasheet

4573

Each GPIO has six registers that control how it is used, or report its status:

•

Use Select

•

I/O Select

•

GPIO Level

•

Trigger Positive Edge

•

Trigger Negative Edge

•

Trigger Status

The Use Select register selects a GPIO pin as a GPIO, or leaves it as its programmed 
function. This register must be set for all other registers to affect the GPIO.

The I/O Select register determines the direction of the GPIO.

The Trigger Positive Edge and Trigger Negative Edge registers enable general purpose 
events on a rising and falling edge respectively. This only applies to GPIOs set as input. 

The Trigger Status register is used by software to determine if the GPIO triggered a 
GPE. This only applies to GPIOs set as input and with one or both of the Trigger modes 
enabled.

Additionally, there is one additional register for each S5 GPIO:

•

Wake Enable

This register allows S5 GPIOs to trigger a wake event based on the Trigger registers’ 
settings.

Each GPIO has two registers that control how it is used, or report its status:
- Pad Configuration (PCONF0)
- Pad Value (PAD_VAL)

Note: These registers are also implemented for the available Virtual GPIOs (vGPIOs).

The Pad Configuration register has the following functions:
- Configure the function of the pin as a GPIO or mulitplexed native functions
- Configure pull resistors
- Configure electrical behaviour
- Configure edge detection
- Configure interrupt handling

Note: The PCONF0 register is valid irrespective of whether or not the pin is conifgured as