116 datasheet(28/50 Pages) RENESAS

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REJ03B0253-0110

Rev.1.10

Page 28 of 95

Jun 23, 2010

R32C/116 Group

3. Memory

Memory

Figure 3.1 shows the memory map of the R32C/116 Group.

The R32C/116 Group provides a 4-Gbyte address space from 00000000h to FFFFFFFFh.

The internal ROM is mapped to the end of the memory map with the ending address fixed at FFFFFFFFh.

Therefore, the 1-Mbyte internal ROM is mapped from FFF00000h to FFFFFFFFh.

The fixed interrupt vector table which contains each start address of interrupt handlers is mapped from

FFFFFFDCh to FFFFFFFFh.

The internal RAM is mapped to the beginning of the memory map with the starting address fixed at

00000400h. Therefore, the 63-Kbyte internal RAM is mapped from 00000400h to 0000FFFFh. Besides

being used for data storage, the internal RAM functions as a stack(s) for subroutines and/or interrupt

handlers.

Special Function Registers (SFRs), which are control registers for peripheral functions, are mapped from

00000000h to 000003FFh, and from 00040000h to 0004FFFFh. Unoccupied SFR locations are reserved.

No access is allowed.

In memory expansion mode or microprocessor mode, some spaces are reserved for internal use and should

not be accessed.

Figure 3.1

Memory Map

Internal RAM

SFR1

SFR2

00000000h

FFFFFFFFh

Reset

NMI

Reserved

BRK instruction

Overflow

Undefined instruction

Watchdog timer (5)

FFFFFFFFh

FFFFFFDCh

YYYYYYYYh

00000400h

XXXXXXXXh

Reserved

00040000h

Internal ROM

(Data space) (1)

00060000h

00062000h

00050000h

Reserved

Internal RAM

Capacity

XXXXXXXXh

63 Kbytes

00010000h

40 Kbytes

0000A400h

Internal ROM

Capacity

YYYYYYYYh

512 Kbytes FFF80000h

640 Kbytes FFF60000h

768 Kbytes FFF40000h

1 Mbyte

FFF00000h

48 Kbytes

0000C400h

External space (2)

Reserved

00080000h

Reserved (3)

FFE00000h

Internal ROM (4)

384 Kbytes FFFA0000h

Notes:

1. Additional two 4-Kbyte spaces (blocks A and B) for storing data are provided in the flash memory version.

2. This space can be used in memory expansion mode or microprocessor mode. Addresses from 02000000h

to FDFFFFFFh are inaccessible.

3. This space is reserved in memory expansion mode. It can be external space in microprocessor mode.

4. This space can be used in single-chip mode or memory expansion mode. It can be external space in

microprocessor mode.

5. The watchdog timer interrupt shares the vector table with the oscillator stop detection interrupt and low

voltage detection interrupt.

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