M68HC08 datasheet(39/124 Pages) FREESCALE

номер детали	M68HC08

подробное описание детали	Microcontrollers

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MC68HC05C9A Advance Information Data Sheet, Rev. 5.1

Freescale Semiconductor

Chapter 6

Low-Power Modes

6.1 Introduction

This section describes the low-power stop and wait modes.

6.2 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 operation.

During 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 condition code register (CCR)

is cleared to enable external interrupts. All other registers and memory remain unaltered. All input/output

(I/O) lines remain unchanged. The processor can be brought out of stop mode only by an external

interrupt or reset. See Figure 6-1.

Figure 6-1. Stop Recovery Timing Diagram

$3FFE

$3FFF

INTERNAL

ADDRESS

BUS

INTERNAL

CLOCK

IRQ

(3)

IRQ

(2)

RESET

OSC1

(1)

ILCH

4064 t

CYC

RESET OR INTERRUPT

VECTOR FETCH

LIH

Notes:

1. Represents the internal gating of the OSC1 pin

2. IRQ pin edge-sensitive mask option

3. IRQ pin level and edge-sensitive mask option

M68HC08 датащи(PDF) 39 Page - Freescale Semiconductor, Inc