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ML9092-03TB Datasheet(PDF) 43 Page - OKI electronic componets |
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ML9092-03TB Datasheet(HTML) 43 Page - OKI electronic componets |
43 / 66 page FEDL9092-01 OKI Semiconductor ML9092-01/02/03/04 43/66 Key Scan The key scanning starts when a key switch is pressed on and ends after all key switches are detected to be off. After the key switch is turned on, when the same key is pressed for two cycles or more, the level of the KREQ signal changes from a “L” to “H” level. In the same manner, the level of the KREQ signal changes from “H” to “L” two cycles after all key switches are turned off. This signal can be used as a flag. To use it as a flag, start key-scan reading when the KREQ signal has changed from “L” to “H.” While the KREQ signal is at a “H” level, carry out key-scan reading periodically. Carry out key scan reading also when the KREQ signal has changed from “H” to “L”. The KREQ signal (the KREQ signal that is sent when the key switch is turned on) is reset when all key switches are detected to be off or when a “L” level is applied to the RESET pin. Scanning stops Key switch OFF Key data reading starts Key switch ON. Scanning starts. KREQ Key switch R0/C0 R1/C1 R2/C2 R3/C3 R4/C4 Notes: 1. Even when the KREQ signal changes from “L” to “H”, chattering for more than one key scan cycle is not absorbed. This should be handled by multiple data reads by software. 2. How simultaneous depression of two keys is processed should be handled by software. 3. When three or more key switches are pressed at the same time, the device may recognize that key(s) that has not been actually pressed has been pressed. Therefore, to recognize simultaneous depression of three or more key switches, add a diode in series to each key (see Figures 1 and 2). To ignore simultaneous depression of three or more key switches, a program may be required to ignore all key data which contains three or more consecutive “1” values. |
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