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參數(shù)資料
| 型號： | MSM9223 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 27-Bit Duplex/Triplex VFD Controller/Driver with Digital Dimming, ADC and Keyscan |
| 中文描述： | 27位雙/三層VFD控制器/驅(qū)動器，帶有數(shù)字調(diào)光，ADC和鍵盤掃描 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大小： | 237K |
| 代理商： | MSM9223 |
Semiconductor
MSM9223
21/24
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]
1 Cycle
INT
ROW 4
ROW 3
ROW 2
ROW 1
ROW 0
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
Release
Keyscan
INT
CS
MODE5
MODE5 : Keyscan stop
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