MC68HC705C9ACFN datasheet(61/157 Pages) FREESCALE

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MC68HC705C9A — Rev. 2.0

Low-Power Modes

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.

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MC68HC705C9ACFN Datasheet(PDF) 61 Page - Freescale Semiconductor, Inc