ST72321R9-Auto datasheet(98/243 Pages) STMICROELECTRONICS

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16-bit timer

ST72321xx-Auto

98/243

Doc ID 13829 Rev 1

16-bit timer

13.1

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 ST7 devices have two on-chip 16-bit timers. They are completely independent, and

do not share any resources. They are synchronized after an MCU reset as long as the timer

clock frequencies are not modified.

This description covers one or two 16-bit timers. In ST7 devices with two timers, register

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

13.2

Main features

●

Programmable prescaler: fCPU divided by 2, 4 or 8

●

Overflow status flag and maskable interrupt

●

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

the choice of active edge

●

1 or 2 Output Compare functions each with:

–

2 dedicated 16-bit registers

–

2 dedicated programmable signals

–

2 dedicated status flags

–

1 dedicated maskable interrupt

●

1 or 2 Input Capture functions each 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)(a)

The block diagram is shown in Figure 41.

Note:

When reading an input signal on a non-bonded pin, the value will always be ‘1’.

Some timer pins may not be available (not bonded) in some ST7 devices. Refer to the device pinout

description.

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