Freescale Semiconductor, Inc.
Technical Data — MC68HC705C8A
Section 6. Low-Power Modes
6.1 Contents
6.2
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
6.3
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
SCI During Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
SPI During Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Programmable COP Watchdog in Stop Mode . . . . . . . . . . .71
Non-Programmable COP Watchdog in Stop Mode . . . . . . .73
6.3.1
6.3.2
6.3.3
6.3.4
6.4
6.4.1
6.4.2
Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Programmable COP Watchdog in Wait Mode . . . . . . . . . . .75
Non-Programmable COP Watchdog in Wait Mode . . . . . . .75
6.5
Data-Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
6.2 Introduction
This section describes the three low-power modes:
• Stop mode
• Wait mode
• Data-retention mode
6.3 Stop Mode
The STOP instruction places the microcontroller unit (MCU) in its lowest
power consumption mode. In stop mode, the internal oscillator is turned
off, halting all internal processing including timer, serial communications
interface (SCI), and master mode serial peripheral interface (SPI)
operation. See Figure 6-1.
MC68HC705C8A — Rev. 3
MOTOROLA
Technical Data
Low-Power Modes
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