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參數(shù)資料
| 型號： | ST6242BQ1/XXX |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 69/69頁 |
| 文件大?。?/td> | 1846K |
| 代理商： | ST6242BQ1/XXX |
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ST62T42B/E42B
MEMORY MAP (Cont’d)
1.3.3 Data Space
Data Space accommodates all the data necessary
for processing the user program. This space com-
prises the RAM resource, the processor core and
peripheral registers, as well as read-only data
such as constants and look-up tables in Program
memory.
1.3.3.1 Data ROM
All read-only data is physically stored in program
memory, which also accommodates the Program
Space. The program memory consequently con-
tains the program code to be executed, as well as
the constants and look-up tables required by the
application.
The Data Space locations in which the different
constants and look-up tables are addressed by the
processor core may be thought of as a 64-byte
window through which it is possible to access the
read-only data stored in Program memory.
1.3.3.2 Data RAM/EEPROM
In ST62T42B and ST62E42B devices, the data
space includes 60 bytes of RAM, the accumulator
(A), the indirect registers (X), (Y), the short direct
registers (V), (W), the I/O port registers, the pe-
ripheral data and control registers, the interrupt
option register and the Data ROM Window Regis-
ter (DRW register).
Additional RAM and EEPROM pages can also be
addressed using banks of 64 bytes located be-
tween addresses 00h and 3Fh.
1.3.4 Stack Space
Stack space consists of six 12-bit registers which
are used to stack subroutine and interrupt return
addresses, as well as the current program counter
contents.
Table 4. Additional RAM/EEPROM Banks.
Table 5. ST62T42B/E42B Data Memory Space
Device
RAM
EEPROM
ST62T42B/E42B
2 x 64 bytes
DATA and EEPROM
000h
03Fh
DATA ROM WINDOW AREA
040h
07Fh
X REGISTER
080h
Y REGISTER
081h
V REGISTER
082h
W REGISTER
083h
DATA RAM
084h
0BFh
PORT A DATA REGISTER
0C0h
PORT B DATA REGISTER
0C1h
SPI INTERRUPT DISABLE REGISTER
0C2h
PORT C DATA REGISTER
0C3h
PORT A DIRECTION REGISTER
0C4h
PORT B DIRECTION REGISTER
0C5h
PORT C DIRECTION REGISTER
0C6h
RESERVED
0C7h
INTERRUPT OPTION REGISTER
0C8h*
DATA ROM WINDOW REGISTER
0C9h*
ROM BANK SELECT REGISTER
0CAh*
RAM/EEPROM BANK SELECT REGISTER
0CBh*
PORT A OPTION REGISTER
0CCh
RESERVED
0CDh
PORT B OPTION REGISTER
0CEh
PORT C OPTION REGISTER
0CFh
A/D DATA REGISTER
0D0h
A/D CONTROL REGISTER
0D1h
TIMER 1 PRESCALER REGISTER
0D2h
TIMER 1 COUNTER REGISTER
0D3h
TIMER 1 STATUS/CONTROL REGISTER
0D4h
TIMER 2 PRESCALER REGISTER
0D5h
TIMER 2 COUNTER REGISTER
0D6h
TIMER 2 STATUS/CONTROL REGISTER
0D7h
WATCHDOG REGISTER
0D8h
RESERVED
0D9h
RESERVED
0DAh
RESERVED
0DBh
LCD MODE CONTROL REGISTER
0DCh
SPI DATA REGISTER
0DDh
RESERVED
0DEh
EEPROM CONTROL REGISTER
0DFh
LCD RAM
0E0h
0F7h
DATA RAM
0F8h
0FEh
ACCUMULATOR
OFFh
* WRITE ONLY REGISTER
9
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