MC68HC908GT16 Datasheet, PDF (60/412 Pages) Motorola, Inc – Microcontrollers

Low-Power Modes
3.10 Low-Voltage Inhibit Module (LVI) . . . . . . . . . . . . . . . . . . . . . . . 65
3.10.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
3.10.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
3.11 Enhanced Serial Communications Interface Module (SCI) . . . 66
3.11.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
3.11.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
3.12 Serial Peripheral Interface Module (SPI) . . . . . . . . . . . . . . . . . 66
3.12.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
3.12.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
3.13 Timer Interface Module (TIM1 and TIM2) . . . . . . . . . . . . . . . . . 67
3.13.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
3.13.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
3.14 Timebase Module (TBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
3.14.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
3.14.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
3.15 Exiting Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
3.16 Exiting Stop Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3.2 Introduction
The microcontroller (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.
3.2.1 Wait Mode
The WAIT instruction puts the MCU in a low-power standby mode in
which the central processor unit (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
CONFIG1 register. (See Section 8. Configuration Register
(CONFIG).)
Technical Data
60
MC68HC908GT16 • MC68HC908GT8 — Rev. 2
Low-Power Modes
MOTOROLA