M68ICS08GR datasheet(35/408 Pages) FREESCALE

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MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Memory Map

Technical Data — MC68HC908GR8

Section 2. Memory Map

2.1 Contents

2.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2.3

Unimplemented Memory Locations . . . . . . . . . . . . . . . . . . . . . . 35

2.4

Reserved Memory Locations . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2.5

Input/Output (I/O) Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2.2 Introduction

The CPU08 can address 64K bytes of memory space. The memory

map, shown in Figure 2-1, includes:

•

8K bytes of FLASH memory, 7680 bytes of user space on the

MC68HC908GR8 or

4K bytes of FLASH memory, 4096 bytes of user space on the

MC68HC908GR4

•

384 bytes of random-access memory (RAM)

•

36 bytes of user-defined vectors

•

310 bytes of monitor routines in read-only memory (ROM)

•

544 bytes of integrated FLASH burn-in routines in ROM

2.3 Unimplemented Memory Locations

Accessing an unimplemented location can cause an illegal address

reset if illegal address resets are enabled. In the memory map (Figure 2-

1) and in register figures in this document, unimplemented locations are

shaded.

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