R8C23 datasheet(14/52 Pages) RENESAS

14 / 52 page

R8C/22 Group, R8C/23 Group

3. Memory

Rev.1.10 Mar 16, 2007

Page 14 of 48

REJ03B0097-0110

3.2

R8C/23 Group

Figure 3.2 shows a Memory Map of R8C/23 Group. The R8C/23 Group has 1 Mbyte of address space from

address 00000h to FFFFFh.

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

48-Kbyte internal ROM is allocated addresses 04000h to 0FFFFh.

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

interrupt routine.

The internal ROM (data flash) is allocated addresses 02400h to 02BFFh.

The internal RAM is allocated higher addresses, beginning with address 00400h. For example, a 2.5-Kbyte

internal RAM is allocated addresses 00400h to 00DFFh. 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 (SFR) are allocated addresses 00000h to 002FFh and 01300h to 0147Fh (SFR area for

CAN). The peripheral function control registers are allocated them. All addresses within the SFR, which have

nothing allocated are reserved for future use and cannot be accessed by users.

Figure 3.2

Memory Map of R8C/23 Group

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer•oscillation stop detection•voltage detection

Address break

(Reserved)

Reset

FFFFFh

0FFFFh

0YYYYh

0XXXXh

00400h

002FFh

00000h

Internal ROM

(program ROM)

Expanding area

Internal RAM

SFR

(Refer to 4. Special

Function Registers

(SFRs))

0FFFFh

0FFDCh

02BFFh

02400h

Internal ROM

(data flash)(1)

Reserved area(2)

01300h

02000h

Internal ROM(4)

(program ROM)

ZZZZZh

NOTES:

1. Data flash block A (1 Kbyte) and B (1 Kbyte) are shown.

2. SFR area for CAN is allocated addresses 01300h to 0147Fh.

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

4. Do not use addresses 20000h to 23FFFh because these areas are used for the emulator debugger. Refer to 24. Notes on

Emulator Debugger.

Part Number

Internal ROM

Size

Address 0YYYYh Address ZZZZZh

R5F21236DFP, R5F21236JFP, R5F21236KFP

R5F21237DFP, R5F21237JFP, R5F21237KFP

R5F21238DFP, R5F21238JFP, R5F21238KFP

R5F2123AJFP, R5F2123AKFP

R5F2123CJFP, R5F2123CKFP

32 Kbytes

48 Kbytes

64 Kbytes

96 Kbytes

128 Kbytes

08000h

04000h

13FFFh

1BFFFh

23FFFh

Internal RAM

Address 0XXXXh

00BFFh

00DFFh

00FFFh

2 Kbytes

2.5 Kbytes

3 Kbytes

5 Kbytes

6 Kbytes

Size

Address 0SSSSh

037FFh

03BFFh

Internal RAM

03000h

0SSSSh

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