M32C83T datasheet(44/527 Pages) RENESAS

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Page 21

3. Memory

)

(

3. Memory

Figure 3.1 shows a memory map of the M32C/83 group (M32C/83, M32C/83T).

M32C/83 group (M32C/83, M32C/83T) 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 addresses FF000016 to FFFFFF16.

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

of each interrupt routine. Refer to 10. Interrupts for details.

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 acknowledged.

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

timers, is allocated addresses 00000016 to 0003FF16. All addresses, which have nothing allocated within

SFR, are reserved space 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 Software Manual for details.

In memory expansion mode and microprocessor mode, some space are reserved and cannot be accessed

by users.

Figure 3.1 Memory Map

SFR

Internal RAM

Reserved Space

External Space(1)

BRK Instruction

Overflow

Undefined Instruction

FFFFFF16

NMI

00000016

00040016

007FFF16

00800016

F0000016

F8000016

FFFFFF16

Reserved Space(2)

Internal ROM(3)

Special Page

Vector Table

Address Match

Watchdog Timer(4)

Reset

NOTES:

1. In memory expansion and microprocessor modes

2. In memory expansion mode. This space becomes external space in microprocessor mode.

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

space in microprocessor mode.

4. Watchdog timer interrupt, oscillation stop detection interrupt, and low voltage detection interrupt share vectors.

FFFFDC16

FFFE0016

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