SPEAR320 datasheet(25/73 Pages) STMICROELECTRONICS

25 / 73 page

SPEAr320

Architecture overview

Doc ID 16755 Rev 5

25/73

Two different modes of operation are available :

●

Auto-reload mode, an interrupt source is activated, the counter is automatically cleared

and then it restarts incrementing.

●

Single-shot mode, an interrupt source is activated, the counter is stopped and the GPT

is disabled.

3.25

PWM timers

SPEAr320 provides 4 PWM timers.

Main features:

●

Prescaler to define the input clock frequency to each timer

●

Programmable duty cycle from 0% to 100%

●

Programmable pulse length

●

APB slave interface for register programming

3.26

Watchdog timer

The ARM watchdog module consists of a 32-bit down counter with a programmable timeout

interval that has the capability to generate an interrupt and a reset signal on timing out. The

watchdog module is intended to be used to apply a reset to a system in the event of a

software failure.

3.27

RTC oscillator

The RTC provides a 1-second resolution clock. This keeps 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.

Main features:

●

Time-of-day clock in 24 hour mode

●

Calendar

●

Alarm capability

●

Isolation mode, allowing RTC to work even if power is not supplied to the rest of the

device.

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