R8C18 datasheet(31/257 Pages) RENESAS

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R8C/18 Group, R8C/19 Group

3. Memory

Rev.1.30

Apr 14, 2006

Page 16 of 233

REJ09B0222-0130

Memory

3.1

R8C/18 Group

Figure 3.1 is a Memory Map of R8C/18 Group. The R8C/18 Group has 1 Mbyte of address space from

addresses 00000h to FFFFFh.

The internal ROM area is allocated lower addresses, beginning with address 0FFFFh. For example, a

16-Kbyte internal ROM is allocated addresses 0C000h to 0FFFFh.

The fixed interrupt vector table is allocated addresses 0FFDCh to 0FFFFh. They store the starting

address of each interrupt routine.

The internal RAM is allocated higher addresses, beginning with address 00400h. For example, a 1-

Kbyte internal RAM area is allocated addresses 00400h to 007FFh. The internal RAM is used not only

for storing data but also for calling subroutines and as stacks when interrupt requests are

acknowledged.

Special function registers (SFRs) are allocated addresses 00000h to 002FFh. The peripheral function

control registers are allocated here. All addresses within the SFR, which have nothing allocated are

reserved for future use and cannot be accessed by users.

Figure 3.1

Memory Map of R8C/18 Group

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer • oscillation stop detection • voltage monitor 2

Address break

(Reserved)

Reset

Part Number

Internal ROM

Internal RAM

Size

Address 0YYYYh

FFFFFh

0FFFFh

0YYYYh

0XXXXh

00400h

002FFh

00000h

Internal ROM

Expanded area

Internal RAM

SFR

(See 4. Special Function

Registers (SFRs))

0FFFFh

0FFDCh

Size

Address 0XXXXh

NOTE:

1. The blank regions are reserved. Do not access locations in these regions.

R5F21184SP, R5F21184DSP, R5F21184DD, R5F21184NP

R5F21183SP, R5F21183DSP, R5F21183DD, R5F21183NP

R5F21182SP, R5F21182DSP, R5F21182DD, R5F21182NP

R5F21181SP, R5F21181DSP, R5F21181DD

16 Kbytes

12 Kbytes

8 Kbytes

4 Kbytes

0C000h

0D000h

0E000h

0F000h

1 Kbyte

768 bytes

512 bytes

384 bytes

007FFh

006FFh

005FFh

0057Fh

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