HC705CT4GRSSLASHD datasheet(59/152 Pages) NXP

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MC68HC705CT4 — Rev. 2.0

General Release Specification

MOTOROLA

16-Bit Timer

General Release Specification — MC68HC705CT4

Section 8. 16-Bit Timer

8.1 Contents

8.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

8.3

Counter Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

8.4

Output Compare Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

8.5

Input Capture Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

8.6

Timer Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

8.7

Timer Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

8.8

Timer During Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

8.9

Timer During Stop Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

8.10

Timer Power Supply Source . . . . . . . . . . . . . . . . . . . . . . . . . . .67

8.2 Introduction

The timer consists of a 16-bit, free-running counter driven by a fixed

divide-by-four prescaler. This timer can be used for many purposes,

including input waveform measurements, while simultaneously

generating an output waveform. Pulse widths can vary from several

microseconds to many seconds.

Because the timer has a 16-bit architecture, each specific functional

segment (capability) is represented by two registers. These registers

contain the high and low byte of that functional segment. Access of the

high byte inhibits that specific timer function until the low byte is also

accessed.

NOTE:

The I bit in the CCR should be set while manipulating both the high and

low byte registers of a specific timer function to ensure that an interrupt

does not occur.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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