R5F6457GLFD datasheet(19/135 Pages) RENESAS

19 / 135 page

R01DS0076EJ0120 Rev.1.20

Page 19 of 129

Aug 07, 2013

R32C/157 Group

3. Memory

Memory

Figure 3.1 shows the memory map of the R32C/157 Group.

The R32C/157 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 512-Kbyte

internal ROM is mapped from FFF80000h 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 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 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

XXXXXXXXh

Reserved

00040000h

Internal ROM

(Data space) (1)

00060000h

00062000h

Reserved

00050000h

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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