ST62T35B ST Microelectronics, ST62T35B Datasheet - Page 10

• Manufacturer Part Number: ST62T35B
• Description: (ST62E35B / ST62T35B) 8-BIT OTP/EPROM MCUs
• Manufacturer: ST Microelectronics

ST62T35B/E35B
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 ST6235B and ST62E35B 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 00ST62T35B and ST62E35Bh
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 3. Additional RAM/EEPROM Banks.
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9
ST62T35B
Device
2 x 64 bytes
RAM
2 x 64 bytes
EEPROM
Table 4. ST62T35B Data Memory Space
ARTIM16COMPAREVALUE REGISTE RHIGH BYTE CMP 0EDh
ARTIM 16 COMPARE VALUE REGISTER LOWBYTE CMP 0EEh
ARTIM16 RELOAD CAPTUR E REG. HIGH BYTE RLCP
ARTIM16 RELOAD CAPTURE REG. LOW BYTE RLCP
* WRITE ONLY REGISTER
ARTIM 16 COMPARE MASK REG. HIGH BYTE MASK
ARTIM16 2ND STATUS CONTROL REGISTER SCR2
ARTIM16 3RD STATUS CONTROL REGISTER SCR3
ARTIM16 4TH STATUS CONTROL REGISTER SCR4
ARTIM16 COMPARE MASK REG. LOW BYTE MASK
ARTIM16 1ST STATUS CONTROL REGISTER SCR1
ARTIM16 CAPT URE REGISTER HIGH BYTE CP
ARTIM16 CAPTURE REGISTER LOW BYTE CP
RAM/EEPROM BANK SELECT REGISTER
TIMER 1 STATUS/CONTROL REGISTER
I/O INTE RRUPT POLARITY REGISTER
SPI INTERRUPT DISABLE REGISTER
UART STATUS CONTROL REGIST ER
OSCILLATOR CONTROL REGISTER
TIMER 1 PRESC ALER REGISTER
INTERRUPT OPTION REGISTER
DATA ROM WINDOW REGISTER
PORT A DIRECTION REGISTER
PORT B DIRECTION REGISTER
PORT C DIRECTION REGISTER
PORT D DIRECTION REGISTER
ROM BANK SELECT REGISTER
EEPROM CONTROL REGISTER
PORT E DIRECTION REGISTER
TIMER 1 COUNTER REGISTER
UART DATA SHIFT REGISTE R
PORT A OPTION REGISTER
PORT B OPTION REGISTER
PORT C OPTION REGISTER
PORT D OPTION REGISTER
PORT E OPTION REGISTE R
DATA ROM WINDOW AREA
A/D CONTROL REGISTER
PORT E DATA REGISTER
PORT C DATA REGISTER
PORT D 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
DATA RAM
0CAh*
0CBh*
0DCh*
0C8h*
0C9h*
OFCh
0CCh
0CDh
0CEh
0CFh
0DAh
0DBh
0DDh
0DEh
0DFh
0EAh
0EBh
0ECh
0FDh
OFFh
0BFh
0C0h
0C1h
0C2h
0C3h
0C4h
0C5h
0C6h
0C7h
0D0h
0D1h
0D2h
0D3h
0D4h
0D5h
0D6h
0D7h
0D8h
0D9h
0E0h
0E1h
0E2h
0E3h
0E8h
0E9h
0EFh
0FBh
0FEh
000h
03Fh
040h
07Fh
080h
081h
082h
083h
084h
0F0h