ST62T45B STMicroelectronics, ST62T45B Datasheet - Page 10
![no-image](/images/manufacturer_photos/0/6/637/stmicroelectronics_sml.jpg)
ST62T45B
Manufacturer Part Number
ST62T45B
Description
8-BIT OTP/EPROM MCU
Manufacturer
STMicroelectronics
Datasheet
1.ST62T45B.pdf
(72 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
www.DataSheet4U.com
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.
10/72
9
ST62T45B/E45B
Device
1 x 64 bytes
RAM
2 x 64 bytes
EEPROM
Table 3. ST62T45B/E45B Data Memory Space
* WRITE ONLY REGISTER
32kHz OSCILLATOR CONTROL REGISTE R
RAM/EEPROM BANK SELECT REGISTER
TIMER 1 STATUS/CONTROL REGISTER
TIMER 2 STATUS/CONTROL REGISTER
SPI INTERRUPT DISABLE REGISTER
TIMER 1 PRESC ALER REGISTER
TIMER 2 PRESC ALER REGISTER
LCD MODE CONTROL REGISTER
INTERRUPT OPTION REGISTER
DATA ROM WINDOW REGISTER
PORT A DIRECTION REGISTER
PORT B DIRECTION REGISTER
PORT C DIRECTION REGISTER
EEPROM CONTROL REGISTER
TIMER 1 COUNTER REGISTER
TIMER 2 COUNTER REGISTER
PORT C OPTION REGISTER
PORT A OPTION REGISTER
PORT B OPTION REGISTER
DATA ROM WINDOW AREA
A/D CONTROL REGISTER
PORT C DATA REGISTER
PORT A DATA REGISTER
PORT B DATA REGISTER
WATCHDOG REGISTER
A/D DATA REGISTER
SPI DATA REGISTER
DATA and EEPROM
ACCUMULATOR
W REGISTER
X REGISTER
Y REGISTER
V REGISTER
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
DATA RAM
DATA RAM
LCD RAM
0CAh*
0CBh*
0C8h*
0C9h*
0CCh
0CDh
0CEh
0CFh
0DAh
0DBh
0DCh
0DDh
0DEh
0DFh
OFFh
0BFh
0C0h
0C1h
0C2h
0C3h
0C4h
0C5h
0C6h
0C7h
0D0h
0D1h
0D2h
0D3h
0D4h
0D5h
0D6h
0D7h
0D8h
0D9h
0E0h
0FEh
000h
03Fh
040h
07Fh
080h
081h
082h
083h
084h
0F7h
0F8h