STR720 datasheet(309/401 Pages) STMICROELECTRONICS

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STR720 - EXTENDED FUNCTION TIMER (EFT)

309/401

21 EXTENDED FUNCTION TIMER (EFT)

21.1 Introduction

The timer consists of a 16-bit counter driven by a programmable prescaler.

It may be used for a variety of purposes, including pulse length measurement of up to two

input signals (input capture) or generation of up to two output waveforms (output compare and

PWM).

Pulse lengths and waveform periods can be modulated from a very wide range using the timer

prescaler.

Note

The two EFT instances available in STR720 device do not implement all the features

described in this chapter. Please refer to Section 5.16: Extended Function Timer

(EFT) on page 43.

21.2 Main Features

■

Programmable prescaler: fAPB divided from 1 to 256, Prescaler register (0 to 255) value +1.

■

Overflow status flag and maskable interrupts

■

External clock input (must be at least 4 times slower than the CPU clock speed) with the

choice of active edge

■

Output compare functions with

– 2 dedicated 16-bit registers

– 2 dedicated programmable signals

– 2 dedicated status flags

– 2 dedicated interrupt flags.

■

Input capture functions with

– 2 dedicated 16-bit registers

– 2 dedicated active edge selection signals

– 2 dedicated status flags

– 2 dedicated interrupt flags.

■

Pulse width modulation mode (PWM)

■

One pulse mode (OPM)

■

PWM input mode

■

Timer global interrupt (5 internally ORed or separated sources, depending on device)

– ICIA: Timer Input capture A interrupt

– ICIB: Timer Input capture B interrupt

– OCIA: Timer Output compare A interrupt

– OCIB: Timer Output compare B interrupt

– TOI: Timer Overflow interrupt.

The Block Diagram is shown in Figure 43.

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