ST63142 datasheet(11/86 Pages) STMICROELECTRONICS

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The Core of the ST631xx Family is implemented

independently from the I/O or memory configura-

tion. Consequently, it can be treated as an inde-

pendent central processor communicating with I/O

and memory via internal addresses, data, and con-

trol busses. The in-core communication is ar-

ranged as shown in the following block diagram

figure; the controller being externally linked to both

the reset and the oscillator, while the core is linked

to the dedicated on-chip macrocells peripherals via

the serial data bus and indirectly for interrupt pur-

poses through the control registers.

Registers

The ST631xx Family Core has six registers and

three pairs of flags available to the programmer.

They are shown in Figure 5 and are explained in

the following paragraphs together with the pro-

gram and data memory page registers.

Accumulator (A). The accumulator is an 8-bit

general purpose register used in all arithmetic cal-

culations, logical operations, and data manipula-

tions. The accumulator is addressed in the data

space as RAM location at address FFh .

Accordingly, the ST631xx instruction set can use

the accumulator as any other register of the data

space.

VR001811

PROGRAM

ROM/EPROM

RESET

OPCODE

FLAG

VALUES

CONTROL

SIGNALS

12

FLAGS

ALU

A-DATA

B-DATA

2

256

DATA SPACE

DATA

RAM / EEPROM

DATA

ACCUMULATOR

INTERRUPTS

RESULTS TO DATA SPACE ( WRITE LINE )

0,0 1 TO 8MHz

ADDRESS / READ LINE

DEDICATIONS

CONTROLLER

ROM / EPROM

OS Cin

OSCout

ADDRESS

DECODER

Progr am Counter

and

6 LAYER STACK

Figure 4. ST631xx Core Block Diagram

SHORT

DIRECT

ADDRESSING

MODE

V REGISTER

W REGISTER

PROGRAM COUNTER

SIX LEVELS

STACK REGISTER

C

Z

NORMAL FLAGS

INTERRUPT FLAGS

NMI FLAGS

INDEX

REGISTER

VA000423

b7

b0

b11

ACCUMULATOR

Y REG. POINTER

X REG. POINTER

Figure 5. ST631xx Core Programming Model

ST631xx CORE

®

ST63140,142,126,156

7/82

Số phần tương tự - ST63142

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Mô tả tương tự - ST63142

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