參數(shù)資料
型號(hào)： M38235G6-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP80
封裝： 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80
文件頁數(shù)： 8/64頁
文件大?。?/td> 922K
代理商： M38235G6-XXXFP
Rev.2.02
Jun 19, 2007
page 14 of 73
REJ03B0146-0202
3823 Group
MEMORY
Special Function Register (SFR) Area
The Special Function Register area in the zero page contains con-
trol 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
The first 128 bytes and the last 2 bytes of ROM are reserved for
device testing and the rest is user area for storing programs.
Interrupt Vector Area
The interrupt vector area contains reset and interrupt vectors.
Zero Page
The 256 bytes from addresses 000016 to 00FF16 are called the
zero page area. The internal RAM and the special function regis-
ter (SFR) are allocated to this area.
The zero page addressing mode can be used to specify memory
and register addresses in the zero page area. Access to this area
with only 2 bytes is possible in the zero page addressing mode.
Special Page
The 256 bytes from addresses FF0016 to FFFF16 are called the
special page area. The special page addressing mode can be
used to specify memory addresses in the special page area.
Access to this area with only 2 bytes is possible in the special
page addressing mode.
Fig. 10 Memory map diagram
640
768
1536
2048
2560
02BF16
033F16
063F16
083F16
0A3F16
RAM area
RAM size
(bytes)
Address
XXXX16
16384
24576
32768
49152
61440
C00016
A00016
800016
400016
100016
C08016
A08016
808016
408016
108016
ROM area
ROM size
(bytes)
Address
YYYY16
Address
ZZZZ16
010016
000016
004016
0A4016
FF0016
FFDC16
FFFE16
FFFF16
XXXX16
ZZZZ16
RAM
ROM
RAM for ROM correction
SFR area
Not used
Interrupt vector area
Reserved ROM area
Zero page
Special page
Reserved ROM area
005016
LCD display RAM area
RAM 1 for ROM correction
RAM 2 for ROM correction
0A0016
0A1F16
0A2016
0A3F16
YYYY16
ROM Code Protect Address
“0016” is written into ROM code protect address (other than the
user ROM area) when selecting the protect bit write by using a se-
rial programmer or selecting protect enabled for writing shipment
by Renesas Technology corp.. When “0016” is set to the ROM
code protect address, the protect function is enabled, so that read-
ing 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 pro-
grammer.
As for the QzROM product shipped after writing, “0016” (protect
enabled) or “FF16” (protect disabled) is written into the ROM code
protect address when Renesas Technology corp. performs writing.
The writing of “0016" or “FF16” can be selected as ROM option
setup (“MASK option” written in the mask file converter) when or-
dering.
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