ST72561J4-Auto datasheet(126/324 Pages) STMICROELECTRONICS

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8-bit timer (TIM8)

ST72561-Auto

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Doc ID 12370 Rev 8

8-bit timer (TIM8)

13.1

Introduction

The timer consists of a 8-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 clock prescaler.

13.2

Main features

●

Programmable prescaler: fCPU divided by 2, 4, 8 or fOSC2 divided by 8000.

●

Overflow status flag and maskable interrupt

●

Output compare functions with

–

2 dedicated 8-bit registers

–

2 dedicated programmable signals

–

2 dedicated status flags

–

1 dedicated maskable interrupt

●

Input capture functions with

–

2 dedicated 8-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

●

4 alternate functions on I/O ports (ICAP1, ICAP2, OCMP1, OCMP2)*

The Block Diagram is shown in Figure 59.

Note:

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

device pin out description.

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

13.3

Functional description

13.3.1

Counter

The main block of the Programmable Timer is a 8-bit free running upcounter and its

associated 8-bit registers.

These two read-only 8-bit registers contain the same value but with the difference that

reading the ACTR register does not clear the TOF bit (Timer overflow flag), located in the

Status register, (SR).

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