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ST6208CB1/XXX

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 20 PINS

STMicroelectronics 

ST62T08C/T09C ST62T10C/T20C/E20C

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

In ST6208C/09C/10C/20C 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 register

(DRW register).

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. ST6208C/09C/10C/20C Data Memory

Space

RESERVED

DATA ROM WINDOW AREA

64 BYTES

X REGISTER

Y REGISTER

V REGISTER

W REGISTER

DATA RAM 60 BYTES

PORT A DATA REGISTER

PORT B DATA REGISTER

RESERVED

RESERVED

PORT A DIRECTION REGISTER

PORT B DIRECTION REGISTER

RESERVED

RESERVED

INTERRUPT OPTION REGISTER

DATA ROM WINDOW REGISTER

RESERVED

PORT A OPTION REGISTER

PORT B OPTION REGISTER

RESERVED

RESERVED

A/D DATA REGISTER(except ST62T08C)

A/D CONTROL REGISTER (except ST62T08C)

TIMER PRESCALER REGISTER

TIMER COUNTER REGISTER

TIMER STATUS CONTROL REGISTER

RESERVED

WATCHDOG 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

0FEh

0FFh

8/70

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