81C55 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

81C55

2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER

Oki Electric Industry 

¡ Semiconductor

Basic Input Mode

RD

tPR

Port Input

Data Bus

MSM81C55-5RS/GS/JS

tRP

Basic Output Mode

WR

tWP

Data Bus

Port Output

Note: The DATA BUS timing is the same as the read and write cycles.

Timer Waveforms 1

Load Counter From

Count Length Register

2

1

5

tf

TIMER IN

tr

TIMER OUT

(Pulse)

(Note)

TIMER OUT

(Square Wave)

(Note)

Load Counter From

Count Length Register

4

3

2

1

5

t2

(T.C)

t1

tCYC

tTL

tTH

tTL

tTH

Count Down(5Æ1)

Note: Periodically outut according to the output mode (m1=1) programming contents.

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