M16C datasheet(29/112 Pages) RENESAS

29 / 112 page

R01DS0015EJ0100 Rev.1.00

Page 29 of 109

Feb 07, 2011

M16C/65C Group

3. Address Space

3.3

Accessible Area in Each Mode

Areas that can be accessed vary depending on processor mode and the status of each control bit. Figure

3.3 shows the Accessible Area in Each Mode.

In single-chip mode, the SFRs, internal RAM, and internal ROM can be accessed.

In memory expansion mode, the SFRs, internal RAM, internal ROM, and external areas can be accessed.

Address space is expandable to 4 MB with the memory area expansion function.

In microprocessor mode, the SFRs, internal RAM, and external areas can be accessed. Address space is

expandable to 4 MB with the memory area expansion function. Allocate ROM to the fixed vector table

from FFFDCh to FFFFFh.

Figure 3.3

Accessible Area in Each Mode

Notes:

1. Do not access reserved areas.

2. The figure above applies under the following conditions:

Single-chip mode and memory expansion mode

- The PM10 bit in the PM1 register is 1

(addresses 0E000h to 0FFFFh are used as data flash)

- The PRG2C0 bit in the PRG2C register is 0 (program ROM 2 enabled)

- The PM13 bit in the PM1 register is 1

(all areas in internal RAM, and the program ROM 1 area from 80000h are usable)

Microprocessor mode

- The PM10 bit is 0 (addresses 0E000h to 0FFFFh are used as the CS2 area)

- The PRG2C0 bit is 1 (program ROM 2 disabled)

00000h

0D000h

00400h

0D800h

0E000h

10000h

14000h

FFFFFh

28000h

27000h

80000h

00000h

0D000h

00400h

0D800h

0E000h

10000h

14000h

FFFFFh

Single-Chip Mode

Memory Expansion Mode

00000h

0D000h

00400h

0D800h

FFFFFh

28000h

27000h

Microprocessor Mode

Internal ROM

(data flash)

Internal ROM

(program ROM 2)

Reserved area

Internal ROM

(program ROM 1)

Reserved area

External area

Internal RAM

Reserved area

SFR

Reserved area

External area

Internal RAM

Reserved area

SFR

Reserved area

Internal RAM

Reserved area

SFR

Internal ROM

(data flash)

Internal ROM

(program ROM 2)

Internal ROM

(program ROM 1)

Reserved area

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