M68ICS08GR datasheet(189/408 Pages) FREESCALE

189 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Monitor ROM (MON)

189

Technical Data — MC68HC908GR8

Section 15. Monitor ROM (MON)

15.1 Contents

15.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

15.3

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

15.4

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

15.5

Security. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

15.2 Introduction

This section describes the monitor ROM (MON) and the monitor mode

entry methods. The monitor ROM allows complete testing of the MCU

through a single-wire interface with a host computer. Monitor mode entry

can be achieved without use of the higher test voltage, VTST, as long as

vector addresses $FFFE and $FFFF are blank, thus reducing the

hardware requirements for in-circuit programming.

15.3 Features

Features of the monitor ROM include:

•

Normal user-mode pin functionality

•

One pin dedicated to serial communication between monitor ROM

and host computer

•

Standard mark/space non-return-to-zero (NRZ) communication

with host computer

•

Execution of code in RAM or FLASH

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

M68ICS08GR 데이터시트(PDF) 189 Page - Freescale Semiconductor, Inc