HC05RC17GRSSLASHD datasheet(55/128 Pages) NXP

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MC68HC05RC17 — Rev. 2.0

General Release Specification

Low-Power Modes

General Release Specification — MC68HC05RC17

Section 6. Low-Power Modes

6.1 Contents

6.2

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

6.3

Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

6.4

Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

6.5

Low-Power Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

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 CTCSR ($08) 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 stop mode only by an external

interrupt or RESET. Refer to Figure 6-1.

NOTE:

If an external interrupt is pending when stop mode is entered, then stop

mode will be exited immediately.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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