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ST62T52B

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, AUTO-RELOAD TIMER AND EEPROM

STMicroelectronics 

ST62T52B ST62T62B/E62B

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 ST62T52B, T62B and ST62E62B devices, the

data space includes 60 bytes of RAM, the accu-

mulator (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

Device

ST62T52B

ST62T62B

RAM

1 x 64 bytes

1 x 64 bytes

EEPROM

-

1 x 64 bytes

Table 2. ST62T52B, T62B and ST62E62B Data

Memory Space

RAM / EEPROM banks

DATA ROM WINDOW AREA

X REGISTER

Y REGISTER

V REGISTER

W REGISTER

DATA RAM 60 BYTES

PORT A DATA REGISTER

PORT B DATA REGISTER

PORT C DATA REGISTER

RESERVED

PORT A DIRECTION REGISTER

PORT B DIRECTION REGISTER

PORT C DIRECTION REGISTER

RESERVED

INTERRUPT OPTION REGISTER

DATA ROM WINDOW REGISTER

RESERVED

PORT A OPTION REGISTER

PORT B OPTION REGISTER

PORT C OPTION REGISTER

RESERVED

A/D DATA REGISTER

A/D CONTROL REGISTER

TIMER PRESCALER REGISTER

TIMER COUNTER REGISTER

TIMER STATUS CONTROL REGISTER

AR TIMER MODE CONTROL REGISTER

AR TIMER STATUS/CONTROL REGISTER1

AR TIMER STATUS/CONTROL REGISTER2

WATCHDOG REGISTER

AR TIMER RELOAD/CAPTURE REGISTER

AR TIMER COMPARE REGISTER

AR TIMER LOAD REGISTER

OSCILLATOR CONTROL REGISTER

MISCELLANEOUS

RESERVED

DATA RAM/EEPROM REGISTER

RESERVED

EEPROM CONTROL REGISTER

RESERVED

ACCUMULATOR

* WRITE ONLY REGISTER

000h

03Fh

040h

07Fh

080h

081h

082h

083h

084h

0BFh

0C0h

0C1h

0C2h

0C3h

0C4h

0C5h

0C6h

0C7h

0C8h*

0C9h*

0CAh

0CBh

0CCh

0CDh

0CEh

0CFh

0D0h

0D1h

0D2h

0D3h

0D4h

0D5h

0D6h

0D7h

0D8h

0D9h

0DAh

0DBh

0DCh*

0DDh

0DEh

0E7h

0E8h*

0E9h

0EAh

0EBh

0FEh

0FFh

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