HC705P6AGRSSLASHD datasheet(31/134 Pages) NXP

31 / 134 page

MC68HC705P6A — Rev. 1.0

General Release Specification

Operating Modes

General Release Specification — MC68HC705P6A

Section 3. Operating Modes

3.1 Contents

3.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

3.3

User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

3.4

Bootloader Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3.5

Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3.5.1

STOP Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3.5.1.1

Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3.5.1.2

Halt Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

3.5.2

WAIT Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

3.6

COP Watchdog Timer Considerations . . . . . . . . . . . . . . . . . . .37

3.2 Introduction

The MC68HC705P6A has two modes of operation that affect the pinout

and architecture of the MCU: user mode and bootloader mode. The user

mode is normally used for the application and the bootloader mode is

used for programming the EPROM. The conditions required to enter

each mode are shown in Table 3-1. The mode of operation is

determined by the voltages on the IRQ/VPP and PD7/TCAP pins on the

rising edge of the external RESET pin.

The mode of operation is also determined whenever the internal COP

watchdog timer resets the MCU. When the COP timer expires, the

voltage applied to the IRQ/VPP pin controls the mode of operation while

the voltage applied to PD7/TCAP is ignored. The voltage applied to

PD7/TCAP during the last rising edge on RESET is stored in a latch and

used to determine the mode of operation when the COP watchdog timer

resets the MCU.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705P6AGRS/D Datasheet(PDF) 31 Page - NXP Semiconductors

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