SPEAR1340 datasheet(23/200 Pages) STMICROELECTRONICS

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SPEAr1340

Device functions

Doc ID 023063 Rev 4

23/200

2.19

General purpose I/O (GPIO/XGPIO)

SPEAr1340 handles generic input/outputs in 3 ways. First, the device integrates 2 instances

of a general purpose I/O (GPIO) digital block, identified as GPIOA and GPIOB. Second, an

extended GPIO (XGPIO) feature is provided. Finally, it is possible to use the KBD controller

in GPIO mode (this feature is documented in Section 2.28: Keyboard controller (KBD)).

The GPIO block provides 16 programmable inputs or outputs (8 for GPIOA and 8 for

GPIOB). Each input/output can be controlled by software.

GPIO main features:

●

16 individually programmable input/output pins (by default input at reset)

●

An APB slave acting as control interface in software mode

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Programmable interrupt generation capability on any number of pins

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Bit masking in both read and writes operation through address lines

The XGPIOs are individually programmable input/output pins (by default output) that can be

controlled through an AHB slave interface.

XGPIO main features:

●

234 individually programmable input/output pins: XGPIO0 to XGPIO7, and XGPIO24 to

XGPIO249 (by default output). There is just an exception for the bit XGPIO169 which is

always an output.

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Programmable interrupt (rise or fall edge sensitive) generation on any number of pins

●

An AHB slave interface as control

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