UPD4990AC データシートの表示（PDF） - NEC => Renesas Technology

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UPD4990AC

SERIAL I/O CALENDAR & CLOCK CMOS LSI

NEC => Renesas Technology 

µPD4990A

° Interval output function

An interrupt signal can be output by selecting an output from TP.

Interrupt signals are output repeatedly at specified intervals until their output is suppressed by a command.

Only output flags can be reset to operate the timer continuously.

0.5 s

1s

1s

Interval of 1 second

1s

Interval Output

Flag Reset

Interval Timer

Clock Stop

The interval signal waveform is rectangular (50 % duty) if not reset.

The interval timer is independent of the Timer Counter, so it is not affected by the resetting of the current

time timer.

30 s

60 s

The interval timer accuracy is ±15.625 ms.

* The interval timer counter is reset by [1, 0, 0, 0] through [1, 0, 1, 1].

Interval Output

Flag Reset

9

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