ST72344S4 datasheet(93/247 Pages) STMICROELECTRONICS

93 / 247 page

ST72344xx, ST2345xx

On-chip peripherals

Doc ID 12321 Rev 6

93/247

11.3

16-bit timer

11.3.1

Introduction

The timer consists of a 16-bit free-running 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 few microseconds to several

milliseconds using the timer prescaler and the CPU clock prescaler.

Some devices of the ST7 family have two on-chip 16-bit timers. They are completely

independent, and do not share any resources. They are synchronized after a Device reset

as long as the timer clock frequencies are not modified.

This description covers one or two 16-bit timers. In the devices with two timers, register

names are prefixed with TA (Timer A) or TB (Timer B).

11.3.2

Main features

●

Programmable prescaler: fCPU divided by 2, 4 or 8.

●

Overflow status flag and maskable interrupt

●

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

–

1 dedicated maskable interrupt

●

Input capture functions with

–

2 dedicated 16-bit registers

–

2 dedicated active edge selection signals

–

2 dedicated status flags

–

1 dedicated maskable interrupt

●

Pulse width modulation mode (PWM)

●

One-pulse mode

●

Reduced-power mode

●

5 alternate functions on I/O ports (ICAP1, ICAP2, OCMP1, OCMP2, EXTCLK). See the

note below.

The block diagram is shown in Figure 42.

Note:

Some timer pins may not be available (not bonded) in some devices. Refer to the device pin

out description. When reading an input signal on a non-bonded pin, the value will always

be ‘1’.

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