Introduction - Motorola MC68HC908GP32 Technical Data Manual

Low-Power Modes

3.2 Introduction

3.2.1 Wait Mode
Technical Data
58
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3.10.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.11 Serial Communications Interface Module (SCI) . . . . . . . . . . . . 63
3.11.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.11.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.12 Serial Peripheral Interface Module (SPI) . . . . . . . . . . . . . . . . . 64
3.12.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.12.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.13 Timer Interface Module (TIM1 and TIM2) . . . . . . . . . . . . . . . . . 64
3.13.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.13.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
3.14 Timebase Module (TBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
3.14.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
3.14.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
3.15 Exiting Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
3.16 Exiting Stop Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
The MCU may enter two low-power modes: wait mode and stop mode.
They are common to all HC08 MCUs and are entered through instruction
execution. This section describes how each module acts in the low-
power modes.
The WAIT instruction puts the MCU in a low-power standby mode in
which the CPU clock is disabled but the bus clock continues to run.
Power consumption can be further reduced by disabling the LVI module
and/or the timebase module through bits in the CONFIG register. (See
Section 8. Configuration Register
Low-Power Modes
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(CONFIG).)
MC68HC908GP32 MC68HC08GP32
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Rev. 6
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MOTOROLA