MC68HSC705C8ACFS datasheet(89/222 Pages) FREESCALE

89 / 222 page

MC68HC705C8A — Rev. 3

Technical Data

MOTOROLA

Capture/Compare Timer

Technical Data — MC68HC705C8A

Section 8. Capture/Compare Timer

8.1 Contents

8.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

8.3

Timer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

8.3.1

Input Capture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

8.3.2

Output Compare . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

8.4

Timer I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

8.4.1

Timer Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

8.4.2

Timer Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

8.4.3

Timer Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

8.4.4

Alternate Timer Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . 98

8.4.5

Input Capture Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 100

8.4.6

Output Compare Registers. . . . . . . . . . . . . . . . . . . . . . . . . 101

8.2 Introduction

This section describes the operation of the 16-bit capture/compare timer.

Figure 8-1 shows the structure of the timer module. Figure 8-2 is a

summary of the timer input/output (I/O) registers.

8.3 Timer Operation

The core of the capture/compare timer is a 16-bit free-running counter.

The counter is the timing reference for the input capture and output

compare functions. The input capture and output compare functions can

latch the times at which external events occur, measure input

waveforms, and generate output waveforms and timing delays. Software

can read the value in the counter at any time without affecting the

counter sequence.

Freescale Semiconductor, Inc.

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MC68HSC705C8ACFS Datasheet(PDF) 89 Page - Freescale Semiconductor, Inc

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