S80C851-4N44 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

S80C851-4N44

CMOS single-chip 8-bit microcontroller with on-chip EEPROM

Philips Electronics 

Philips Semiconductors

CMOS single-chip 8-bit microcontroller

with on-chip EEPROM

Product specification

80C851/83C851

ALE

PSEN

WR

PORT 0

PORT 2

tWHLH

tLLWL

tAVLL

tAW

tLLAX

A0–A7

FROM RI OR DPL

tAVWL

tWLWH

tQVWX

tQVWH

DATA OUT

tWHQX

A0–A7 FROM PCL

P2.0–P2.7 OR A8–A15 FROM DPH

A8–A15 FROM PCH

Figure 6. External Data Memory Write Cycle

INSTR IN

XTAL1

INPUT

ALE

PSEN

S1

P1 P2

S2

P1 P2

ONE MACHINE CYCLE

S3

S4

P1 P2 P1 P2

S5

P1 P2

S6

S1

P1 P2 P1 P2

S2

P1 P2

ONE MACHINE CYCLE

S3

S4

S5

P1 P2 P1 P2 P1 P2

S6

P1 P2

RD

WR

EXTERNAL

PROGRAM

MEMORY

FETCH

BUS

PORT 0

DATA

ADDRESS

FLOAT

PORT 2

(EXTERNAL)

FLOAT

DATA

ADDRESS

FLOAT

FLOAT

DATA

ADDRESS

FLOAT

ADDRESS TRANSITIONS

FLOAT

DATA

ADDRESS

FLOAT

FLOAT

PORT

OUTPUT

OLD DATA

NEW DATA

PORT

INPUT

SERIAL

PORT

(SHIFT CLOCK)

SAMPLING TIME OF I/O PORT PINS DURING INPUT (INCLUDING INT0 AND INT1)

Figure 7. Instruction Timing

1998 Jul 03

15

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