R5F6451MLFD datasheet(19/122 Pages) RENESAS

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R01DS0072EJ0120 Rev.1.20

Page 19 of 116

Aug 07, 2013

R32C/151 Group

3. Memory

Memory

Figure 3.1 shows the memory map of the R32C/151 Group.

The R32C/151 Group provides a 4-Gbyte address space from 00000000h to FFFFFFFFh.

The internal ROM is mapped from address FFFFFFFFh in the inferior direction. For example, the 1-Mbyte

internal ROM is mapped from FFF00000h to FFFFFFFFh.

The fixed interrupt vector table contains the start address of interrupt handlers and is mapped from

FFFFFFDCh to FFFFFFFFh.

The internal RAM is mapped from address 00000400h in the superior direction. For example, the 48-Kbyte

internal RAM is mapped from 00000400h to 0000C3FFh. Besides being used for data storage, the internal

RAM functions as a stack(s) for subroutine calls 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,

and no access is allowed.

Figure 3.1

Memory Map

Internal RAM

SFR1

SFR2

Internal ROM

00000000h

FFFFFFFFh

Reset

NMI

Reserved

Watchdog timer (2)

Reserved

BRK instruction

Overflow

Undefined instruction

FFFFFFFFh

FFFFFFDCh

Notes:

1. The flash memory version provides two additional 4-Kbyte spaces (blocks A and B) for storing data.

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

detection interrupt.

YYYYYYYYh

00000400h

0000C400h

Reserved

00040000h

Internal ROM

(Data space) (1)

00060000h

00062000h

Reserved

00050000h

Reserved

Internal ROM

Capacity

YYYYYYYYh

768 Kbytes FFF40000h

1 Mbyte

FFF00000h

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