參數(shù)資料
型號： M37542M4-XXXHP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQCC36
封裝： 6 X 6 MM, 0.50 MM PITCH, PLASTIC, WQFN-36
文件頁數(shù)： 32/122頁
文件大?。?/td> 1311K
代理商： M37542M4-XXXHP
7542 Group
Rev.3.03
Jul 11, 2008
Page 17 of 117
REJ03B0006-0303
Memory
Special function register (SFR) area
The SFR area in the zero page contains control registers such as
I/O ports and timers.
RAM
RAM is used for data storage and for a 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.
The reserved ROM area can program/erase in the flash memory
version.
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-
ters (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. Ac-
cess to this area with only 2 bytes is possible in the special page
addressing mode.
Fig. 15 Memory map diagram
010016
000016
004016
044016
FF0016
FFDC16
FFFE16
FFFF16
384
512
1024
XXXX16
01BF16
023F16
043F16
8192
16384
32768
E00016
C00016
800016
E08016
C08016
808016
YYYY16
ZZZZ16
RAM
ROM
Reserved area
SFR area
Not used
Interrupt vector area
ROM area
Reserved ROM area
(128 bytes)
Zero page
Special page
RAM area
RAM capacity
(bytes)
address
XXXX16
ROM capacity
(bytes)
address
YYYY16
Reserved ROM area
address
ZZZZ16
Not used
SFR area (Note 1)
0FE016
0FFF16
Notes 1: Only flash memory version has this SFR area.
2: The reserved ROM area can program/erase in the flash memory version.
Note the difference of the mask version.
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