Datasheet

ManualsBrandsRENESAS ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller LQFP 48 (7x7) 16-Bit 20 MHz I/O number 41

R8C/22 Group, R8C/23 Group 3. Memory

Rev.2.00 Aug 20, 2008 Page 13 of 48

REJ03B0097-0200

3. Memory

3.1 R8C/22 Group

Figure 3.1 shows a Memory Map of R8C/22 Group. The R8C/22 Group has 1 Mbyte of address space from

address 00000h to FFFFFh.

The internal 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 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 here. All addresses within the SFR, which have

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

Figure 3.1 Memory Map of R8C/22 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)

Internal RAM

SFR

(Refer to 4. Special

Function Registers

(SFRs))

0FFFFh

0FFDCh

NOTES:

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

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

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

Emulator Debugger.

Reserved area

(1)

01300h

02000h

Internal ROM

(3)

(program ROM)

Part Number

Internal ROM

Size Address 0YYYYh Address ZZZZZh

R5F21226DFP, R5F21226JFP, R5F21226KFP

R5F21227DFP, R5F21227JFP, R5F21227KFP

R5F21228DFP, R5F21228JFP, R5F21228KFP

R5F2122AJFP, R5F2122AKFP

R5F2122CJFP, R5F2122CKFP

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

ZZZZZh

Internal RAM

03000h

0SSSSh

Address 0SSSSh

037FFh

03BFFh