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ST62E45B Datenblatt(PDF) 10 Page - STMicroelectronics

Teilenummer ST62E45B
Bauteilbeschribung  8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST62E45B Datenblatt(HTML) 10 Page - STMicroelectronics

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ST62T45B/E45B
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 ST62T45B and ST62E45B 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 2. Additional RAM/EEPROM Banks.
Table 3. ST62T45B/E45B Data Memory Space
Device
RAM
EEPROM
ST62T45B/E45B
1 x 64 bytes
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 REGIS TER
0C3h
PORT A DIRECTION REGISTER
0C4h
PORT B DIRECTION REGISTER
0C5h
PORT C DIREC TION REGISTER
0C6h
RESERVED
0C7h
INTERRUPT OPTION REGISTER
0C8h*
DATA ROM WINDOW REGIS TER
0C9h*
RESERVED
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 REGIS TER
0D1h
TIMER 1 PRESC ALER REGISTER
0D2h
TIMER 1 COUNTER REGIS TER
0D3h
TIMER 1 STATUS/CONTROL REGISTER
0D4h
TIMER 2 PRESC ALER REGISTER
0D5h
TIMER 2 COUNTER REGIS TER
0D6h
TIMER 2 STATUS/CONTROL REGISTER
0D7h
WATCHDOG REGISTER
0D8h
RESERVED
0D9h
RESERVED
0DAh
32kHz OSCILLATOR CONTROL REGISTE R
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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