Datasheet

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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cale Semiconductor,
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