Renesas R8C/25 User Manual download pdf (Page 19)

R8C/24 Group, R8C/25 Group 3. Memory

Rev.3.00 Feb 29, 2008 Page 17 of 51

REJ03B0117-0300

3.2 R8C/25 Group

Figure 3.2 is a Memory Map of R8C/25 Group. The R8C/25 group has 1 Mbyte of address space from addresses

00000h to FFFFFh.

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

48-Kbyte internal ROM area 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 area is allocated higher addresses, beginning with address 00400h. For example, a 2-Kbyte

internal RAM is allocated addresses 00400h to 00BFFh. 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 3.2 Memory Map of R8C/25 Group

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer/oscillation stop detection/voltage monitor

(Reserved)

Reset

Part Number

Internal ROM Internal RAM

Size Address 0YYYYh

R5F21254SNFP, R5F21254SNXXXFP,

R5F21254SDFP, R5F21254SDXXXFP,

R5F21254SNLG, R5F21254SNXXXLG

R5F21255SNFP, R5F21255SNXXXFP,

R5F21255SDFP, R5F21255SDXXXFP

R5F21256SNFP, R5F21256SNXXXFP,

R5F21256SDFP, R5F21256SDXXXFP,

R5F21256SNLG, R5F21256SNXXXLG

R5F21257SNFP, R5F21257SNXXXFP,

R5F21257SDFP, R5F21257SDXXXFP

R5F21258SNFP, R5F21258SNXXXFP,

R5F21258SDFP, R5F21258SDXXXFP

16 Kbytes

24 Kbytes

32 Kbytes

48 Kbytes

64 Kbytes

007FFh

00BFFh

00DFFh

00FFFh

FFFFFh

0FFFFh

0YYYYh

00400h

002FFh

00000h

Internal ROM

(program ROM)

Internal RAM

SFR

(Refer to 4. Special

Function Registers

(SFRs))

0FFFFh

0FFDCh

Address 0XXXXhAddress 1ZZZZh Size

1 Kbyte

2 Kbytes

2.5 Kbytes

3 Kbytes

Internal ROM

(data flash)

(1)

NOTES:

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

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

0XXXXh

02400h

02BFFh

Internal ROM

(program ROM)

1ZZZZh

−

13FFFh

0C000h

0A000h

08000h

04000h

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 60 61

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