38D2 datasheet(16/136 Pages) RENESAS

16 / 136 page

Rev.3.02

Apr 10, 2008

Page 16 of 131

REJ03B0177-0302

38D2 Group

MEMORY

• Special Function Register (SFR) Area

The Special Function Register area in the zero page contains

control registers such as I/O ports and timers.

• RAM

RAM is used for data storage and for stack area of subroutine

calls and interrupts.

•ROM

In the QzROM version, the first 128 Kbytes and the last 2 bytes

are reserved for device testing and the rest is the user area. Also,

1 byte of address FFDB16 is reserved.

In the flash memory version, programming and erase operations

can be performed to reserved ROM areas.

• Interrupt Vector Area

The interrupt vector area contains reset and interrupt vectors.

• Zero Page

Access to this area with only 2 bytes is possible in the zero page

addressing mode.

• Special Page

Access to this area with only 2 bytes is possible in the special

page addressing mode.

• ROM Code Protect Address in QzROM Version (Address

FFDB16)

Address FFDB16 as reserved ROM area in the QzROM version

is ROM code protect address. “0016” or “FE16” is written into

this address when selecting the protect bit write by using a serial

programmer and selecting protect enabled for writing shipment

by Renesas Technology Corp. When “0016” or “FE16” is set to

the ROM code protect address, the protect function is enabled, so

that reading or writing from/to the corresponding area is disabled

by a serial programmer.

As for the QzROM product in blank, the ROM code is protected

by selecting the protect bit write at ROM writing with a serial

programmer.

The protect can be performed, dividing twice. The protect area 1

is from the beginning address of ROM to address “EFFF16”.

As for the QzROM product shipped after writing, “0016” (protect

enabled to all area), “FE16” (protect enabled to the protect area 1)

or “FF16” (protect disabled) is written into the ROM code protect

address when Renesas Technology Corp. performs writing. The

writing of “0016”, “FE16” or “FF16” can be selected as ROM

option setup (“MASK option” written in the mask file converter)

when ordering.

For the ROM code protect in the flash memory version, refer to

the “FLASH MEMORY MODE”.

<Notes>

• After a reset, the contents of RAM are undefined. Make sure to

set the initial value before use.

• When Renesas ships QzROM write products, we write ROM

option data* specified by the mask file converter MM to the

ROM code protect address. Therefore, set FF16 to the ROM

code protect address in ROM data regardless of the presence

or absence of a protect. When data other than FF16 is set, we

may ask that the ROM data be submitted again.

* ROM option data: mask option noted in MM

Fig. 9 Memory map diagram

Reserved area

SFR area

0FF016

100016

SFR area

Interrupt vector area

ROM area

Reserved ROM area

(128 bytes)

010016

000016

004016

084016

FF0016

FFDC16

FFFE16

FFFF16

Zero page

Special page

RAM area

RAM size

(bytes)

Address

XXXX16

192

256

384

512

640

768

896

1024

1536

2048

XXXX16

00FF16

013F16

01BF16

023F16

02BF16

033F16

03BF16

043F16

063F16

083F16

ROM size

(bytes)

Address

YYYY16

Address

ZZZZ16

4096

8192

12288

16384

20480

24576

28672

32768

36864

40960

45056

49152

53248

57344

61440

F00016

E00016

D00016

C00016

B00016

A00016

900016

800016

700016

600016

500016

400016

300016

200016

100016

F08016

E08016

D08016

C08016

B08016

A08016

908016

808016

708016

608016

508016

408016

308016

208016

108016

YYYY16

ZZZZ16

Reserved ROM area

RAM

ROM

Protect area 1

EFFF16

FFDB16

Reserved ROM area

(ROM code protect)

Not used

0FD016

Reserved area

(2)

Note 1: This area is available in the flash memory version only.

2: ROM correction vectors are assigned. As for the details, refer to the “ROM CORRECTION FUNCTION”.

3: In the flash memory version, programming and erase operations can be performed to reserved ROM areas.

Note that their areas are different from those in the QzROM version.

(2)

Reserved ROM area

(ID code)

FFD416

(1)

SFR area

0FEF16

0FE016

(1)

LCD display RAM area

004C16

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