R32C121 datasheet(18/113 Pages) RENESAS

18 / 113 page

REJ03B0237-0050 Rev.0.50 Jul 31, 2008

Page 18 of 111

Under development

Preliminary Specification

This is a preliminary specification and is subject to change.

R32C/121 Group

3. Memory

Memory

Figure 3.1 shows a memory mapping of the R32C/121 Group.

The R32C/121 Group provides 4-Gbyte address space from 00000000h to FFFFFFFFh.

The internal ROM is allocated from address FFFFFFFFh down. For example, a 512-Kbyte internal ROM is

addressed from FFF80000h to FFFFFFFFh.

The fixed interrupt vectors are allocated from address FFFFFFDCh to FFFFFFFFh in which the starting

address of each interrupt handler is stored.

The internal RAM is allocated from address 00000400h up. For example, a 32-Kbyte internal RAM is

addressed from 00000400h to 000083FFh. Besides being used for data storage, the internal RAM functions

as stack(s) for a subroutine and/or an interrupt handler.

Special Function Registers (SFRs), consisting of control registers for peripheral functions, are allocated

from address 00000000h to 000003FFh and from 00040000h to 0004FFFFh. Any blank spaces within the

SFRs are reserved. No access is allowed.

Figure 3.1

Memory Mapping

Internal RAM

SFR1

SFR2

Internal ROM

00000000h

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 oscillation 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

12 Kbytes

00003400h

Internal ROM

Capacity

YYYYYYYYh

128 Kbytes FFFE0000h

256 Kbytes FFFC0000h

384 Kbytes FFFA0000h

512 Kbytes FFF80000h

20 Kbytes

00005400h

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