st62t65b STMicroelectronics, st62t65b Datasheet - Page 9

• Manufacturer Part Number: st62t65b
• Description: 8-bit Otp/eprom Mcus With A/d Converter, Auto-reload Timer, Eeprom And Spi
• Manufacturer: STMicroelectronics

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 OTP/
EPROM.
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 OTP/EPROM.
1.3.3.2 Data RAM/EEPROM
In ST62T55B, ST62T65B and ST62E65B devices,
the data space includes 60 bytes of RAM, the ac-
cumulator (A), the indirect registers (X), (Y), the
short direct registers (V), (W), the I/O port regis-
ters, the peripheral data and control registers, the
interrupt option register and the Data ROM Win-
dow register (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 1. Additional RAM/EEPROM Banks
ST62T55BB
ST62T65B/E65B
Device
1 x 64 bytes
1 x 64 bytes
RAM
2 x 64 bytes
EEPROM
-
Table 2. ST62T55B, ST62T65B and ST62E65B
Data Memory Space
* WRITE ONLY REGISTER
AR TIMER STATUS/ CONTROL REGISTER1
AR TIMER STATUS/ CONTROL REGISTER2
AR TIMER RELOAD/CAPTU RE REGISTER
AR TIMER MODE CONTROL REGISTER
TIMER STATUS CONTROL REGISTER
OSCILLATOR CONTROL REGISTE R
AR TIMER COMPARE REGISTER
INTERRUPT OPTION REGISTER
DATA ROM WINDOW REGISTER
DATA RAM/EEPRO M REGISTER
PORT A DIRECTION REGISTER
PORT B DIRECTION REGISTER
PORT C DIRECTION REGISTER
TIMER PRESCA LER REGISTER
EEPROM CONTROL REGISTER
TIMER COUNTE R REGISTER
PORT A OPTION REGISTER
PORT B OPTION REGISTER
PORT C OPTION REGISTER
AR TIMER LOAD REGISTER
DATA ROM WINDOW AREA
PORT C DATA REGISTE R
A/D CONTROL REGISTER
PORT A DATA REGISTER
PORT B DATA REGISTER
WATCHDO G REGISTER
SPI DIVIDER REGISTER
DATA RAM 60 BYTES
SPI MODE REGISTER
A/D DATA REGISTE R
SPI DATA REGISTER
RAM and EEPROM
MISCELLANEOUS
ACCUMULATOR
W REGISTE R
X REGISTER
Y REGISTER
V REGISTER
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
ST62T55B ST62T65B/E65B
0DCh*
0C8h*
0C9h*
0E8h*
0CAh
0CBh
0CCh
0CDh
0CEh
0DAh
0DBh
0DDh
0DEh
0BFh
0C0h
0C1h
0C2h
0C3h
0C4h
0C5h
0C6h
0C7h
0CFh
0D0h
0D1h
0D2h
0D3h
0D4h
0D5h
0D6h
0D7h
0D8h
0D9h
0DFh
0E0h
0E1h
0E2h
0E3h
0E7h
0E9h
0EAh
0EBh
0FEh
0FFh
000h
03Fh
040h
07Fh
080h
081h
082h
083h
084h
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