M37544 datasheet(13/68 Pages) RENESAS

13 / 68 page

7544 Group

Rev.1.04

2004.06.08

page 13 of 66

REJ03B0012-0104Z

Memory

Special function register (SFR) area

The SFR area in the zero page contains control registers such as

I/O ports and timers.

RAM

RAM is used for data storage and for a stack area of subroutine

calls and interrupts.

ROM

The first 128 bytes and the last 2 bytes of ROM are reserved for

device testing and the rest is a user area for storing programs.

Interrupt vector area

The interrupt vector area contains reset and interrupt vectors.

Zero page

The 256 bytes from addresses 000016 to 00FF16 are called the

zero page area. The internal RAM and the special function regis-

ters (SFR) are allocated to this area.

The zero page addressing mode can be used to specify memory

and register addresses in the zero page area. Access to this area

with only 2 bytes is possible in the zero page addressing mode.

Special page

The 256 bytes from addresses FF0016 to FFFF16 are called the

special page area. The special page addressing mode can be

used to specify memory addresses in the special page area. Ac-

cess to this area with only 2 bytes is possible in the special page

addressing mode.

■ Note on use

The content of RAM is undefined when the microcomputer is re-

set. The initial values must be surely set before you use it.

Fig. 13 Memory map diagram

010016

000016

004016

044016

FF0016

FFDC16

FFFE16

FFFF16

256

XXXX16

013F16

8192

E00016

E08016

YYYY16

ZZZZ16

RAM

ROM

Reserved area

SFR area

Disable

Interrupt vector area

ROM area

Reserved ROM area

(128 bytes)

Zero page

Special page

RAM area

RAM capacity

(bytes)

address

XXXX16

ROM capacity

(bytes)

address

YYYY16

Reserved ROM area

address

ZZZZ16

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