32C84 datasheet(22/89 Pages) RENESAS

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Page 22

3. Memory

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3. Memory

Figure 3.1 shows a memory map of the M32C/84 group (M32C/84, M32C/84T).

The M32C/84 group (M32C/84, M32C/84T) provides 16-Mbyte address space from addresses 00000016 to

FFFFFF16.

The internal ROM is allocated lower addresses beginning with address FFFFFF16. For example, a 64-

Kbyte internal ROM is allocated in addresses FF000016 to FFFFFF16.

The fixed interrupt vectors are allocated addresses FFFFDC16 to FFFFFF16. It stores the starting address

of each interrupt routine.

The internal RAM is allocated higher addresses beginning with address 00040016. For example, a 10-

Kbyte internal RAM is allocated addresses 00040016 to 002BFF16. Besides storing data, it becomes stacks

when the subroutine is called or an interrupt is acknowleged.

SFR, consisting of control registers for peripheral functions such as I/O port, A/D converter, serial I/O, and

timers, is allocated addresses 00000016 to 0003FF16. All blank spaces within SFR are reserved and

cannot be accessed by users.

The special page vectors are allocated addresses FFFE0016 to FFFFDB16. It is used for the JMPS instruc-

tion and JSRS instruction. Refer to the Renesas publication M32C/80 Series Software Manual for details.

In memory expansion mode and microprocessor mode, some spaces are reserved and cannot be ac-

cessed by users.

Figure 3.1 Memory Map

SFR

Internal RAM

Reserved Space

External Space(1)

BRK Instruction

Overflow

Undefined Instruction

FFFFFF16

NMI

00000016

00040016

0063FF16

00F00016

00FFFF16

F0000016

F8000016

FFFFFF16

Reserved Space(2)

Internal ROM(4)

Special Page

Vector Table

Address Match

Watchdog Timer(5)

Reset

NOTES:

1. In memory expansion mode and microprocessor mode.

2. In memory expansion mode.

This space becomes external space in microprocessor mode.

3. Additional 4-Kbyte space is provided in flash memory version for storing data.

This space can be used in single-chip mode and memory expansion mode.

This space becomes reserved space in microprocessor mode.

4. This space can be used in single-chip mode and memory expansion mode.

This space becomes external space in microprocessor mode.

5. Watchdog timer interrupts, oscillation stop detect interrupts,

and voltage down detect interrupts share vectors.

FFFFDC16

FFFE0016

Internal ROM

(3)

(Data space)

Internal ROM

Capacity

192 Kbytes

320 Kbytes

512 Kbytes

YYYYYY16

FA000016

384 Kbytes

FD000016

FB000016

Internal RAM

Capacity

16 Kbytes

24 Kbytes

XXXXXX16

0043FF16

10 Kbytes

002BFF16

0063FF16

F8000016

FE000016

128 Kbytes

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