M80C51 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

M80C51

CMOS 8-Bit Microcontroller

Oki Electric Industry 

CYCLE

M1

M1

M2

M1

STEP

S1 S2 S3 S4 S5 S6 S1

1

XTAL1

0

1

ALE

0

PSEN

1

0

1

RD/WR

0

1

PORT-0

PCL

PCL

0

PORT-2

1 PCH

0

1

CPU¨PORT

0

1

PORT¨CPU

0

PCH

PCH

DATA STABLE

PORT OLD DATA

S2 S3 S4

PCL

PCH

Instruction decoding

PC+1

Instruction execution

PC+1

TM+1

Instruction decoding

PC+1

TM+1

S5 S6 S1 S2 S3 S4

DPL&Rr

ACC & RAM

DPH & PORT DATA

PORT NEW DATA

Instruction execution

TM+1

S5 S6 S1 S2 S3 S4 S5 S6

PCL

PCH

PCL

PCL

PCH

PCH

DATA STABLE

Instruction decoding

PC+1

Instruction execution

PC+1

TM+1

Port output/input

Instruction execution

External data memory instruction

execution

Port output/input

Instruction execution

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