R8C28 datasheet(13/71 Pages) RENESAS

13 / 71 page

R8C/28 Group, R8C/29 Group

3. Memory

Rev.1.10

May 17, 2007

Page 13 of 67

REJ03B0169-0110

Memory

3.1

R8C/28 Group

Figure 3.1 is a Memory Map of R8C/28 Group. The R8C/28 group has 1 Mbyte of address space from addresses

00000h to FFFFFh.

The internal ROM is allocated lower addresses, beginning with address 0FFFFh. For example, a 16-Kbyte internal

ROM area 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/28 Group

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer/oscillation stop detection/voltage monitor

(Reserved)

Reset

00400h

002FFh

00000h

Internal RAM

SFR

(Refer to 4. Special

Function Registers

(SFRs))

0FFFFh

0FFDCh

NOTE:

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

FFFFFh

0FFFFh

0YYYYh

Internal ROM

(program ROM)

Expanded area

0XXXh

Part Number

Internal ROM

Internal RAM

Size

Address 0YYYYh

Size

Address 0XXXXh

R5F21284SNSP, R5F21284SDSP,

R5F21284JSP, R5F21284KSP,

R5F21284SNXXXSP, R5F21284SDXXXSP,

R5F21284JXXXSP, R5F21284KXXXSP

8 Kbytes

16 Kbytes

0E000h

0C000h

512 bytes

1 Kbyte

005FFh

007FFh

R5F21282SNSP, R5F21282SDSP,

R5F21282SNXXXSP, R5F21282SDXXXSP

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