M38039G8HKP datasheet(15/92 Pages) RENESAS

15 / 92 page

Rev.1.10

Nov 14, 2005

Page 15 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

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

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

subroutine calls and interrupts.

•ROM

The first 128 bytes and the last 2 bytes of ROM are reserved for

device testing and the rest is a user area for storing programs. In

the QzROM version, 1 byte of address FFDB16 is also a reserved

area.

• 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 (address FFDB16)

Address FFDB16, which is the reserved ROM area of QzROM, is

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

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

programmer or 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 QzROM 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.

<Notes>

Since the contents of RAM are undefined at reset, be sure to set

an initial value before use.

Fig 10. Memory map diagram

SFR area

Interrupt vector area

Zero page

Special page

Reserved ROM area

(128 bytes)

User ROM area

RAM

ROM

010016

000016

004016

0FDF16

0FE016

FF0016

083F16

084016

FFFE16

FFFF16

YYYY16

ZZZZ16

Not used

FFDB16

Not used

0FFF16

100016

Reserved ROM area

(ROM code protect address)

FFDC16

RAM area

RAM size

(bytes)

Address

XXXX16

192

256

384

512

640

768

896

1024

1536

2048

00FF16

013F16

01BF16

023F16

02BF16

033F16

03BF16

043F16

063F16

083F16

ROM area

ROM size

(bytes)

Address

YYYY16

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

Address

ZZZZ16

F08016

E08016

D08016

C08016

B08016

A08016

908016

808016

708016

608016

508016

408016

308016

208016

108016

EFFF16

F00016

Protect area 1

XXXX16

Reserved area

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