STA8100GA datasheet(16/42 Pages) STMICROELECTRONICS

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General description

STA8100GA

16/42

DS13006 Rev 4

3.11

GPIO

There are 34 GPIOs in this device.

The GPIO block provides programmable inputs or outputs. Each input or output can be

controlled in two modes:

•

Software mode through an APB bus interface

•

Alternate function mode, where GPIO becomes a peripheral input or output line

Any GPIO input can be independently enabled or disabled (masked) for interrupt

generation. User can select for each GPIO which edge (rising, falling, both) will trigger an

interrupt.

A de-bouncing logic can be enabled for each GPIO to filter glitches on IOs before going to

the Interrupt generation and CPU read value.

All GPIOs are fail safe to avoid leakage consumption in any condition even when the ring is

off and the external line is logic level high.

3.12

Multi Timer Unit (MTU)

Multi Timer Unit consists of eight timers. Each timer is clocked by MXTAL frequency divided

by 8 (which means 2.4 MHz with a 19.2 MHz crystal) or REFCLK (32.768 kHz) inputs.

3.12.1

MTU feature overview

•

The Multi Timer Unit provides access to four interrupt generating programmable 32-bit

Free-Running decrementing Counters (FRCs) allowing up to four counts to be

performed in parallel.

•

The FRCs have their own clock input, allowing the counters to run from a much slower

clock than the system clock.

•

In each FRC the 32-bit counter is split up into two 16-bit counters.

3.13

RTC

This is an always-on power domain dedicated to RTC logic (backup system) with 256 bytes

SRAM and supplied with a dedicated voltage regulator.

The RTC provides a high resolution clock which can be used for GPS. It keeps the time

when the system is inactive and can be used to wake the system up when a programmed

alarm time is reached. It has a clock trimming feature to compensate for the accuracy of the

32.768 kHz crystal and a secured time update.

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