ST6285 データシートの表示（PDF） - STMicroelectronics

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ST6285

8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER

STMicroelectronics 

ST62T85B/E85B

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 ST62T85B and ST62E85B 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).

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 3. Additional RAM/EEPROM Banks.

Device

RAM EEPROM LCD RAM

ST62T85B/E85B 2 x 64 bytes 2 x 64 bytes 2 x 64 bytes

Table 4. ST62T85B/E85B Data Memory Space

DATA RAM/EEPROM, LCD RAM

DATA ROM WINDOW AREA

X REGIST ER

Y REGIST ER

V REGIST ER

W REGISTE R

000h

03Fh

040h

07Fh

080h

081h

082h

083h

DATA RAM

PORT A DATA REGISTER

PORT B DATA REGISTER

SPI INTERRUPT DISABLE REGISTER

PORT C DATA REGISTER

PORT A DIRECTION REGISTER

PORT B DIRECTION REGISTER

PORT C DIRECTION REGISTE R

RESERVED

INTER RUPT OPTION REGISTER

084h

0BFh

0C0h

0C1h

0C2h

0C3h

0C4h

0C5h

0C6h

0C7h

0C8h*

DATA ROM WINDOW REGISTE R

0C9h*

ROM BANK SELECT REGISTER

0CAh*

DATA RAM/EEPROM, LCD BANK SELECT REGISTER 0CBh*

PORT A OPTION REGISTE R

0CCh

RESERVED

0CDh

PORT B OPTION REGISTE R

0CEh

PORT C OPTION REGISTER

0CFh

A/D DATA REGISTER

0D0h

A/D CONTROL REGIST ER

0D1h

TIMER 1 PRESCALER REGISTER

0D2h

TIMER 1 COUNTE R REGISTER

0D3h

TIMER 1 STATUS/CONTROL REGISTER

RESERVED

UART DATA REGISTER

UART CONTROL REGISTER

WATCHDOG REGISTER

RESERVED

LCD MODE CONTROL REGISTE R

SPI DATA REGISTER

RESERVED

0D4h

0D5h

0D6h

0D7h

0D8h

0D9h

0DAh

0DBh

0DCh

0DDh

0DEh

EEPROM CONTROL REGISTER

0DFh

0E0h

RESERVED

ARTIMER MODE/CONTROL REGISTER

ARTIMER STATUS/CONTROL REGISTER 0

ARTIMER STATUS/CONTROL REGISTER 1

RES ERVED

ARTIMER RELOAD/CAPTU RE REGIST ER

ARTIMER COMPARE REGISTE R

ARTIMER LOAD REGISTER

0E4h

0E5h

0E6h

0E7h

0E9h

0EAh

0EBh

0ECh

RES ERVED

ACCUMULATOR

* WRIT E ONLY REGISTER

0FEh

OFFh

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