MC908QT4MPE datasheet(119/184 Pages) FREESCALE

119 / 184 page

MC68HC908QY/QT Family Data Sheet, Rev. 5

Freescale Semiconductor

119

Chapter 14

Timer Interface Module (TIM)

14.1 Introduction

This section describes the timer interface module (TIM). The TIM is a two-channel timer that provides a

timing reference with input capture, output compare, and pulse-width-modulation functions. Figure 14-2

is a block diagram of the TIM.

14.2 Features

Features of the TIM include the following:

•

Two input capture/output compare channels

–

Rising-edge, falling-edge, or any-edge input capture trigger

–

Set, clear, or toggle output compare action

•

Buffered and unbuffered pulse width modulation (PWM) signal generation

•

Programmable TIM clock input

–

7-frequency internal bus clock prescaler selection

–

External TIM clock input

•

Free-running or modulo up-count operation

•

Toggle any channel pin on overflow

•

TIM counter stop and reset bits

14.3 Pin Name Conventions

The TIM shares two input/output (I/O) pins with two port A I/O pins. The full names of the TIM I/O pins are

listed in Table 14-1. The generic pin name appear in the text that follows.

Table 14-1. Pin Name Conventions

TIM Generic Pin Names:

TCH0

TCH1

TCLK

Full TIM Pin Names:

PTA0/TCH0

PTA1/TCH1

PTA2/TCLK

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