7641 datasheet(12/138 Pages) RENESAS

12 / 138 page

7641 Group

Rev.4.00

Aug 28, 2006

page 12 of 135

REJ03B0191-0400

MEMORY

Special Function Register (SFR) Area

The Special Function Register area in the zero page contains control

registers such as I/O ports and timers.

RAM

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

and interrupts.

ROM

The first 128 bytes and the last 4 bytes of ROM are reserved for

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

flash memory version, program and erase can be performed in the

reserved area.

Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

Zero Page

Access to this area with only 2 bytes is possible in the zero page

addressing mode.

Special Page

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

addressing mode.

Refer to page 74 for the memory map of memory expansion and

microprocessor modes.

Fig. 9 Memory map diagram

1024

2560

046F16

0A6F16

RAM area

RAM size

(bytes)

Address

XXXX16

000016

007016

FF0016

FFCA16

FFFC16

FFFF16

XXXX16

800016

808016

RAM

ROM

SIZE: 32768 bytes

SFR area

Not used

Interrupt vector area

Reserved ROM area

(128 bytes)

Zero page

Special page

Reserved ROM area

010016

100016

Reserved area (Note 1)

SFR area

(Note 2)

FFC916

M37641M8

M37641F8

Notes1: Reserved area in M37641F8.

2: SFR area in M37641F8.

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