7540 datasheet(34/366 Pages) RENESAS

34 / 366 page

1-15

REJ09B0018-0200Z

Rev.2.00

Jun 21, 2004

7540 Group

HARDWARE

FUNCTIONAL DESCRIPTION

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.

Fig. 13 Memory map diagram

010016

000016

004016

044016

FF0016

FFDC16

FFFE16

FFFF16

384

512

768

XXXX16

01BF16

023F16

033F16

8192

16384

32768

E00016

C00016

800016

E08016

C08016

808016

YYYY16

ZZZZ16

RAM

ROM

Reserved area

SFR area

Not used

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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