ML9228 データシートの表示（PDF） - Oki Electric Industry

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ML9228

82-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, Keyscan

Oki Electric Industry 

OKI Semiconductor

FEDL9228-01

ML9228

Keyscan

Keyscanning is started only when depression or release of any key is detected in order to minimize noise caused by

scanning signal. Then, keyscanning is continued until the keyscan stop mode is sent from a microcomputer. The

INT pin goes to the high level at the completion of 1-cycle scanning after the keyscan start, so the (high level)

signal sent from the INT pin can be used as an interrupt signal.

[Keyscan Timing]

ROW 1

ROW 2

ROW 3

ROW 4

ROW 5

INT

1 Cycle

Depress/Release

Keyscan stop mode

is selected.

Note:

Keyscanning cannot be stopped by selecting the keyscan stop mode only once if:

- keyscanning is started after depression or release of any key is detected, and then

- a key is depressed or released again before the keyscan stop mode is selected.

To stop keyscanning, it is required to select the keyscan stop mode once again.

Depress

Depress

Release

INT

Keyscan

Keyscan

Keyscan

CS

MODE5

MODE5 : Keyscan stop

MODE5

MODE5

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