SDIP56 Просмотр технического описания (PDF) - STMicroelectronics

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SDIP56

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

STMicroelectronics 

ST62T46B/E46B

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 ST62T46B and ST62E46B 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 1. Additional RAM/EEPROM Banks.

Device

ST62T46B/E46B

RAM

1 x 64 bytes

EEPROM

2 x 64 bytes

Table 2. ST62T46B/E46B Data Memory Space

DATA and EEPROM

DATA ROM WINDOW AREA

X REGISTER

Y REGISTER

V REGISTER

W REGISTE R

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 REGISTER

RESERVED

INTERRUPT OPTION REGISTER

DATA ROM WIND OW REGISTER

RESERVED

RAM/EEPROM BANK SELECT REGISTER

PORT A OPTION REGISTER

RESERVED

PORT B OPTION REGISTER

PORT C OPTION REGISTE R

A/D DATA REGISTE R

A/D CONTROL REGISTER

TIMER 1 PRESCALER REGISTER

TIMER 1 COUNTE R REGISTER

TIMER 1 STATUS/CONTROL REGISTER

TIMER 2 PRESCALER REGISTER

TIMER 2 COUNTE R REGISTER

TIMER 2 STATUS/CONTROL REGISTER

WATCHDOG REGISTER

RESERVED

PSS STATUS/CONTROL REGISTER

32kHz OSCILLATOR CONTROL REGISTER

LCD MODE CONTROL REGISTER

SPI DATA REGISTER

RESERVED

EEPROM CONTROL REGISTER

LCD RAM

DATA RAM

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

0DFh

0E0h

0F7h

0F8h

0FEh

OFFh

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