R5F6456GLFD datasheet(19/120 Pages) RENESAS

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REJ03B0233-0110

Rev.1.10

Page 19 of 115

Nov 09, 2010

R32C/156 Group

3. Memory

Memory

Figure 3.1 shows the memory map of the R32C/156 Group.

The R32C/156 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 512-Kbyte internal ROM is mapped from FFF80000h 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 32-Kbyte internal RAM is mapped from 00000400h to 000083FFh. 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.

Figure 3.1

Memory Map

Internal RAM

SFR1

SFR2

Internal ROM

000 00000 h

FFFFFFFFh

Reset

NMI

Reserved

Watchdog timer (2)

Reserved

BRK instruction

Overflow

Undefined instruction

FFFFFFFFh

FFFFFFDCh

Notes:

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

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

voltage detection interrupt.

YYYYYYYYh

0000 0400h

XXXXXXXXh

Reserved

0004 0000h

Internal ROM

(Data space) (1)

0006 0000h

0006 2000h

Reserved

000 50000 h

Reserved

Internal RAM

Capacity

XXXXXXXXh

32 Kbytes

00008400h

24 Kbytes

00006400h

Internal ROM

Capacity

YYYYYYYYh

256 Kbytes

FFFC0000h

384 Kbytes

FFFA0000h

512 Kbytes

FFF80000h

20 Kbytes

00005400h

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