R8C2A datasheet(22/66 Pages) RENESAS

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R8C/2A Group, R8C/2B Group

3. Memory

Rev.2.10

Nov 26, 2007

Page 20 of 60

REJ03B0182-0210

Memory

3.1

R8C/2A Group

Figure 3.1 is a Memory Map of R8C/2A Group. The R8C/2A 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 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 RAM is allocated higher addresses, beginning with address 00400h. For example, a 2.5-Kbyte internal

RAM area 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 (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/2A Group

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer, oscillation stop detection, voltage monitor

(Reserved)

Reset

Internal ROM

Internal RAM

Size

Address 0YYYYh

48 Kbytes

64 Kbytes

96 Kbytes

128 Kbytes

−

13FFFh

1BFFFh

23FFFh

00DFFh

00FFFh

011FFh

00400h

002FFh

00000h

Internal RAM

SFR

(Refer to 4. Special

Function Registers

(SFRs))

0FFFFh

0FFDCh

Address 0XXXXh

NOTE:

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

Address ZZZZZh

Size

2.5 Kbytes

3 Kbytes

7 Kbytes

7.5 Kbytes

04000h

FFFFFh

0FFFFh

0YYYYh

Internal ROM

(program ROM)

Expanded area

Internal ROM

(program ROM)

ZZZZZh

0XXXXh

03000h

Internal RAM

0WWWWh

−

03DFFh

03FFFh

Address 0WWWWh

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