RM0319 datasheet(357/368 Pages) STMICROELECTRONICS

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RM0319

General purpose timers (GPT)

Doc ID 022640 Rev 3

357/368

General purpose timers (GPT)

This chapter focuses on GPT functionality and operation.

For technical details about the programmable registers related to the GPT, refer to the GPT

registers in the following companion document:

●

RM0321: SPEAr320S address map and registers

37.1

Overview

General purpose timers can be used for precise timing measurement and for measurement

of frequency of any input signal. They are essentially counters that increment based on the

clock cycle and the timer prescaler. An application can monitor these counters to determine

how much time has elapsed. GPT can have timer and capture mode capabilities.

SPEAr320S provides six general purpose timers (GPTs) grouped in three timer pairs GPT0,

GPT1 and GPT2.

37.2

Main features

●

Each timer pair consists of 2 channels, each channel consists of a programmable 16-bit

counter and a dedicated 8-bit timer clock prescaler.

●

The programmable prescaler performs a clock division by 1 up to 256, and different

input frequencies can be chosen through SPEAr320S configuration registers (so we

can synthesize, for instance, a frequency range from 3.96 Hz to 48 MHz).

●

Three modes of operation are available for each timer channel:

–

Auto-reload mode

–

Single-shot mode

–

Capture mode

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