65C datasheet(27/112 Pages) RENESAS

27 / 112 page

R01DS0015EJ0100 Rev.1.00

Page 27 of 109

Feb 07, 2011

M16C/65C Group

3. Address Space

Address Space

3.1

Address Space

The M16C/65C Group has a 1 MB address space from 00000h to FFFFFh. Address space is expandable to

4 MB with the memory area expansion function. Addresses 40000h to BFFFFh can be used as external

areas from bank 0 to bank 7. Figure 3.1 shows the Address Space. Areas that can be accessed vary

depending on processor mode and the status of each control bit.

Figure 3.1

Address Space

Bank 7

Bank 6

Bank 5

Bank 4

Bank 3

Bank 2

Bank 1

In 4 MB mode

Internal RAM

Reserved area

00000h

0D000h

SFR

00400h

SFR

0D800h

Internal ROM

(data flash)

0E000h

Internal ROM

(program ROM 2)

10000h

Reserved area

Internal ROM

(program ROM 1)

14000h

FFFFFh

Reserved area

28000h

27000h

External area

40000h

BFFFFh

Bank 0

04000h

External area

The internal RAM is allocated

from address 00400h higher.

Program ROM 1 is allocated from

address FFFFFh lower.

When data flash is enabled

When program ROM 2

is enabled

Memory expansion mode

1 MB

address space

512 KB

× 8

Notes:

1. Do not access reserved areas.

2. The figure above applies under the following condition:

- The PM13 bit in the PM1 register is 0

(addresses 04000h to 0CFFFh and 80000h to CFFFFh are used as external areas)

D0000h

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