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5962-8601601QA

CMOS 8/16-Bit Microprocessor

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Functional Diagram

EXECUTION UNIT

REGISTER FILE

DATA POINTER

AND

INDEX REGS

(8 WORDS)

80C88

BUS INTERFACE UNIT

RELOCATION

REGISTER FILE

SEGMENT REGISTERS

AND

INSTRUCTION POINTER

(5 WORDS)

16-BIT ALU

FLAGS

BUS

INTERFACE

UNIT

SSO/HIGH

4 A19/S6. . . A16/S3

8 AD7-AD0

8 A8-A15

3 INTA, RD, WR

4 DT/R, DEN, ALE, IO/M

TEST

INTR

NMI

RQ/GT0, 1 2

HOLD

HLDA

4-BYTE

INSTRUCTION

QUEUE

CONTROL AND TIMING

LOCK

2

QS0, QS1

3

S2, S1, S0

CLK

3

RESET READY MN/MX GND

VCC

MEMORY INTERFACE

C-BUS

BUS

INTERFACE

UNIT

B-BUS

ES

CS

SS

DS

IP

INSTRUCTION

STREAM BYTE

QUEUE

A-BUS

EXECUTION UNIT

CONTROL SYSTEM

EXECUTION

UNIT

AH

AL

BH

BL

CH

CL

DH

DL

SP

BP

SI

DI

ARITHMETIC/

LOGIC UNIT

FLAGS

3-3

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