M68ICS08GR datasheet(157/408 Pages) FREESCALE

157 / 408 page

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Flash Memory

157

Technical Data — MC68HC908GR8

Section 11. Flash Memory

11.1 Contents

11.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

11.3

Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

11.4

FLASH Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . .159

11.5

FLASH Page Erase Operation . . . . . . . . . . . . . . . . . . . . . . . . 160

11.6

FLASH Mass Erase Operation . . . . . . . . . . . . . . . . . . . . . . . . 161

11.7

FLASH Program/Read Operation . . . . . . . . . . . . . . . . . . . . . .162

11.8

FLASH Block Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .163

11.9

Wait Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

11.10 STOP Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

11.2 Introduction

This section describes the operation of the embedded FLASH memory.

This memory can be read, programmed, and erased from a single

external supply. The program, erase, and read operations are enabled

through the use of an internal charge pump.

11.3 Functional Description

The FLASH memory is an array of 7,680 bytes for the MC68HC908GR8

or 4,096 bytes for the MC68HC908GR4 with an additional 36 bytes of

user vectors and one byte used for block protection. An erased bit reads

as logic 1 and a programmed bit reads as a logic 0. The program and

erase operations are facilitated through control bits in the Flash Control

Freescale Semiconductor, Inc.

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