ST6201CB1 datasheet(8/70 Pages) STMICROELECTRONICS

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ST62T00C/T01C ST62T03C/E01C

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 ST6200C/01C/03C devices, the data space in-

cludes 60 bytes of RAM, the accumulator (A), the

indirect registers (X), (Y), the short direct registers

(V), (W), the I/O port registers, the peripheral data

and control registers, the interrupt option register

and the Data ROM Window register (DRW regis-

ter).

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. ST6200C/01C/03C Data Memory Space

RESER VED

000h

03Fh

DATA ROM WINDOW AREA

64 BYTES

040h

07Fh

X REGISTER

080h

Y REGISTER

081h

V REGISTER

082h

W REGISTER

083h

DATA RAM 60 BYTES

084h

0BFh

PORT A DATA REGISTE R

0C0h

PORT B DATA REGISTE R

0C1h

RESER VED

0C2h

RESER VED

0C3h

PORT A DIRECTION REGISTE R

0C4h

PORT B DIRECTION REGISTE R

0C5h

RESER VED

0C6h

RESER VED

0C7h

INTERRUPT OPTION REGISTER

0C8h*

DATA ROM WINDOW REGISTER

0C9h*

RESER VED

0CAh

0CBh

PORT A OPTION REGISTER

0CCh

PORT B OPTION REGISTER

0CDh

RESER VED

0CEh

RESER VED

0CFh

A/D DATA REGIS TER(except ST62T03C)

0D0h

A/D CONTROL REGIS TER (except ST62T03C)

0D1h

TIMER PRESCALER REGISTER

0D2h

TIMER COUNTE R REGISTE R

0D3h

TIMER STATU S CONTRO L REGISTER

0D4h

RESER VED

0D5h

0D6h

0D7h

WATCH DOG REGISTER

0D8h

RESER VED

0D9h

0FEh

ACCUMULATOR

0FFh

* WRITE ONLY REGISTER

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