32C80 datasheet(15/60 Pages) RENESAS

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3. Memory

Figure 3.1 shows a memory map of the M32C/80 Group.

The M32C/80 Group provides 16-Mbyte address space addressed from 00000016 to FFFFFF16.

The fixed interrupt vectors are allocated from address FFFFDC16 to FFFFFF16. It stores the starting ad-

dress of each interrupt routine.

The internal RAM is allocated from address 00040016 to higher. For example, a 8-Kbyte internal RAM is

allocated from address 00040016 to 0023FF16. Besides storing data, it becomes stacks when the subrou-

tine is called or an interrupt is acknowledged.

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

timers, is allocated from address 00000016 to 0003FF16. All blank spaces within SFRs are reserved and

cannot be accessed by users.

The special page vector table is addressed from 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 microprocessor mode, some spaces are reserved and cannot be accessed by users.

SFRs

Internal RAM

Reserved Space

External Space

BRK Instruction

Overflow

Undefined Instruction

FFFFFF16

NMI

00000016

00040016

0023FF16

01000016

FFFFFF16

Special Page

Vector Table

Address Match

Watchdog Timer(1)

Reset

NOTE:

1. Watchdog timer interrupt and oscillation stop detection interrupt share vectors.

FFFFDC16

FFFE0016

Figure 3.1 Memory Map

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