MC68HC705C9A_1 Datasheet, PDF (61/157 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification — MC68HC705C9A
Section 6. Low-Power Modes
6.1 Contents
6.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
6.3 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
6.4 Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
6.2 Introduction
This section describes the low-power modes.
6.3 Stop Mode
The STOP instruction places the MCU in its lowest-power consumption
mode. In stop mode, the internal oscillator is turned off, halting all
internal processing, including timer operation.
During the stop mode, the TCR bits are altered to remove any pending
timer interrupt request and to disable any further timer interrupts. The
timer prescaler is cleared. The I bit in the CCR is cleared to enable
external interrupts. All other registers and memory remain unaltered. All
input/output lines remain unchanged. The processor can be brought out
of the stop mode only by an external interrupt or reset. See Figure 6-1.
MC68HC705C9A — Rev. 2.0
Low-Power Modes
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