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¡ Semiconductor

MSM81C55-5RS/GS/JS

Basic Input Mode

RD

Port Input

Data Bus

1

2

3

4

5

1

2

5

TIMER IN

t1

TIMER OUT

(Pulse)

TIMER OUT

(Square Wave)

Load Counter From

Count Length Register

Load Counter From

Count Length Register

Count Down(5Æ1)

(Note)

(T.C)

(Note)

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

Timer Waveforms 1

WR

Data Bus

Port Output

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

Basic Output Mode