M68ICS08GR datasheet(329/408 Pages) FREESCALE

329 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Timebase Module (TBM)

329

Technical Data — MC68HC908GR8

Section 21. Timebase Module (TBM)

21.1 Contents

21.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

21.3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

21.4

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330

21.5

Timebase Register Description. . . . . . . . . . . . . . . . . . . . . . . . 331

21.6

Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

21.7

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .333

21.2 Introduction

This section describes the timebase module (TBM). The TBM will

generate periodic interrupts at user selectable rates using a counter

clocked by the external crystal clock. This TBM version uses 15 divider

stages, eight of which are user selectable.

For further information regarding timers on M68HC08 family devices,

please consult the HC08 Timer Reference Manual, TIM08RM/AD.

21.3 Features

Features of the TBM module include:

•

Software programmable 1 Hz, 4 Hz, 16 Hz, 256 Hz, 512 Hz, 1024

Hz, 2048 Hz, and 4096 Hz periodic interrupt using external 32.768

kHz crystal

•

User selectable oscillator clock source enable during stop mode to

allow periodic wakeup from stop

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