HC705E5GRSSLASHD datasheet(25/148 Pages) NXP

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MC68HC705E5 — Rev. 1.0

General Release Specification

Memory

General Release Specification — MC68HC705E5

Section 2. Memory

2.1 Contents

2.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

2.3

EPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

2.4

RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

2.5

Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

2.6

2.2 Introduction

The MC68HC705E5 has an 8-Kbyte memory map, consisting of user

erasable, programmable read-only memory (EPROM), user random

access memory (RAM), bootloader ROM, control registers, and

input/output (I/O). Refer to Figure 2-1 for the memory map and Figure

2-2 for the register map.

2.3 EPROM

The user EPROM consists of 5120 bytes of EPROM from $0B00 to

$1EFF and 16 bytes of user vectors from $1FF0 to $1FFF.

The bootloader ROM and vectors are located from $1F01 to $1FEF.

All of the user vectors, $1FF2 through $1FFF, are dedicated to reset and

interrupt vectors. Location $1F00 is the mask option register (MOR).

2.4 RAM

The user RAM, including the stack area, consists of 384 bytes located

from $0080 to $01FF. The stack begins at address $00FF. The stack

pointer can access 64 bytes of RAM from $00FF to $00C0. Using the

stack area for data storage or temporary work locations requires care to

prevent it from being overwritten due to stacking from an interrupt or

subroutine call.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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