ST62T46B datasheet(10/72 Pages) STMICROELECTRONICS

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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.

Table 2. ST62T46B/E46B Data Memory Space

Device

RAM

EEPROM

ST62T46B/E46B

1 x 64 bytes

2 x 64 bytes

DATA and EEPROM

000h

03Fh

DATA ROM WINDOW AREA

040h

07Fh

X REGIS TER

080h

Y REGIS TER

081h

V REGIS TER

082h

W REGISTE R

083h

DATA RAM

084h

0BFh

PORT A DATA REGISTER

0C0h

PORT B DATA REGISTER

0C1h

SPI INTERRUPT DISA BLE REGISTER

0C2h

PORT C DATA REGISTER

0C3h

PORT A DIRECTION REGIS TER

0C4h

PORT B DIRECTION REGIS TER

0C5h

PORT C DIRECTION REGISTER

0C6h

RESERVED

0C7h

INTERRUPT OPTION REGISTER

0C8h*

DATA ROM WIND OW REGISTER

0C9h*

RESERVED

0CAh*

RAM/EEPROM BANK SELECT REGISTER

0CBh*

PORT A OPTION REGISTER

0CCh

RESERVED

0CDh

PORT B OPTION REGISTER

0CEh

PORT C OPTION REGISTE R

0CFh

A/D DATA REGISTE R

0D0h

A/D CONTROL REGIS TER

0D1h

TIMER 1 PRESCALER REGIS TER

0D2h

TIMER 1 COUNTE R REGISTER

0D3h

TIMER 1 STATUS/CONTROL REGISTER

0D4h

TIMER 2 PRESCALER REGIS TER

0D5h

TIMER 2 COUNTE R REGISTER

0D6h

TIMER 2 STATUS/CONTROL REGISTER

0D7h

WATCHDOG REGISTER

0D8h

RESERVED

0D9h

PSS STATUS/CONTROL REGISTER

0DAh

32kHz OSCILLATOR CONTROL REGISTER

0DBh

LCD MODE CONTROL REGISTER

0DCh

SPI DATA REGISTER

0DDh

RESERVED

0DEh

EEPROM CONTROL REGISTER

0DFh

LCD RAM

0E0h

0F7h

DATA RAM

0F8h

0FEh

ACCUMULATOR

OFFh

* WRITE ONLY REGISTER

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