R8C33A datasheet(13/56 Pages) RENESAS

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R8C/33A Group

3. Memory

REJ03B0228-0100 Rev.1.00

Sep 10, 2009

Page 13 of 53

Memory

3.1

R8C/33A Group

Figure 3.1 is a Memory Map of R8C/33A Group. The R8C/33A Group has a 1-Mbyte address space from addresses

00000h to FFFFFh. The internal ROM (program ROM) is allocated lower addresses, beginning with address

0FFFFh. For example, a 32-Kbyte internal ROM area is allocated addresses 08000h to 0FFFFh.

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

routine is stored here.

The internal ROM (data flash) is allocated addresses 03000h to 03FFFh.

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 data storage but also as

a stack area when a subroutine is called or when an interrupt request is acknowledged.

Special function registers (SFRs) are allocated addresses 00000h to 002FFh and 02C00h to 02FFFh. Peripheral

function control registers are allocated here. All unallocated spaces within the SFRs are reserved and cannot be

accessed by users.

Figure 3.1

Memory Map of R8C/33A Group

0FFFFh

0FFDCh

Notes:

1. Data flash indicates block A (1 Kbyte), block B (1 Kbyte), block C (1 Kbyte), and block D (1 Kbyte).

2. The blank areas are reserved and cannot be accessed by users.

FFFFFh

0FFFFh

0YYYYh

0XXXXh

00400h

002FFh

00000h

Internal ROM

(program ROM)

Internal RAM

SFR

(Refer to 4. Special

Function Registers

(SFRs))

02FFFh

02C00h

SFR

(Refer to 4. Special Function

Registers (SFRs))

ZZZZZh

Internal ROM

(program ROM)

03FFFh

03000h

Internal ROM

(data flash) (1)

0FFD8h

Reserved area

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer, oscillation stop detection, voltage monitor

Address break

(Reserved)

Reset

Part Number

R5F21331ANFP, R5F21331ADFP

R5F21332ANFP, R5F21332ADFP

R5F21334ANFP, R5F21334ADFP

R5F21335ANFP, R5F21335ADFP

R5F21336ANFP, R5F21336ADFP

Internal ROM

Internal RAM

Size

Address 0YYYYh

Size

Address 0XXXXh

Address ZZZZZh

4 Kbytes

8 Kbytes

16 Kbytes

24 Kbytes

32 Kbytes

0F000h

0E000h

0C000h

0A000h

08000h

512 bytes

1 Kbyte

1.5 Kbytes

2 Kbytes

2.5 Kbytes

005FFh

007FFh

009FFh

00BFFh

00DFFh

−

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