SPEAR1340 datasheet(35/200 Pages) STMICROELECTRONICS

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SPEAr1340

Device functions

Doc ID 023063 Rev 4

35/200

2.32

General purpose timers (GPT)

The SPEAr1340 device integrates 4 instances of a general purpose timer (GPT) digital

block, identified as GPT0, GPT1, GPT2, GPT3. Each instance is a dual timer, for total 8

independent timers.

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.

Main features:

●

It is constituted by 2 channels; each one consists of a programmable 16-bit counter and

a dedicated 4-bit timer clock prescaler

●

The programmable 4-bit prescaler unit performs a clock division by 1, 2, 4, 8, 16, 32,

64, 128 and 256

●

Three interrupt sources (MATCH, REDG, and FEDG) are available for each timer

channel. They are mapped to a single interrupt line for each channel but may be

individually masked and acknowledged

●

Each timer has a separate register set to control, enable and run each channel

separately

●

Three modes of operations are available for each timer channel:

–

Auto-reload mode

–

Single-shot mode

–

Capture function

2.33

PWM generators (PWM)

The PWM is a pulse-width modulation (PWM) timer module with four independent channels

(PWM1, PWM2, PWM3, and PWM4). All four channels are functionally identical. Using a

16-bit counter, each PWM channel generates a rectangular output pulse with programmable

duty factor (0 to 100%) and frequency.

The four channels can work either synchronously or asynchronously.

Main features:

●

Four independent PWM channels

●

Synchronous and asynchronous working modes

●

Prescaler to define the input clock frequency for each timer

●

Programmable duty factor from 0 to 100%

●

Programmable pulse frequency

●

APB slave interface for programming registers

●

APB clock (PCLK ~ 83 MHz) as the prescaler source clock

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