SIO1007 datasheet(48/108 Pages) MICROCHIP

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SIO1007

DS00002020A-page 48

 2005 - 2015 Microchip Technology Inc.

Note 14-2

The GPIO Data Registers are located at the offset shown from the RUNTIME REGISTERS BLOCK

address.

14.3

GPIO Control

Each GPIO port has an 8-bit control register that controls the behavior of the pin. These registers are defined in the

Configuration section of this specification.

Each GPIO port may be configured as either an input or an output. If the pin is configured as an output, it can be pro-

grammed as open-drain or push-pull. Inputs and outputs can be configured as non-inverting or inverting. GPIO Direction

Registers determine the port direction, GPIO Polarity Registers determine the signal polarity, and GPIO Output Type

tion, Polarity and Output Type Registers control the GPIO pin when the pin is configured for the GPIO function and when

the pin is configured for the alternate function for all pins.

The basic GPIO configuration options are summarized in Table 14-3.

In addition, each GPIO pin has a programmable weak pull-up (45

A) to VCC. The Pull-up control is independent of

GPIO direction, buffer type, and Alternate Function selection. Each GPIO pin has a bit in a GPIO PULLUP Register,

which enables the pin’s pull-up.

TABLE 14-2:

GENERAL PURPOSE I/O PORT ASSIGNMENTS

Default

Function

Alternate

Function

Data

Data Register

Bit No.

Offset

(HEX)

Pullup

Control

(Note 14-2)

Pullup

Bit No.

GPIO10

GP1

CR38

GPIO11

GPIO12

IO_SMI#

GPIO13

IRQIN1

GPIO14

IRQIN2

GPIO15

GPIO16

GPIO17

GPIO 30

GP3

CR37

GPIO 31

GPIO 32

GPIO33

GPIO34

GPIO35

GPIO36

GPIO37

TABLE 14-3:

GPIO CONFIGURATION SUMMARY

Selected

Function

Direction Bit

Polarity Bit

Description

GPIO

Pin is a non-inverted output.

Pin is an inverted output.

Pin is a non-inverted input.

Pin is an inverted input.

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