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HT818D0 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc |
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HT818D0 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc |
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8 / 14 page  HT818D0 8 March 15, 2000 Key features · Key priority When two or more keys are triggered simulta- neously, the output voice is determined by the key priority as shown below: KEY1>KEY2>......KEY11>KEY12 · Key debounce time There are four kinds of key-in debounce time that can be selected by mask option, namely 700ms, 22ms, 45ms and 180ms. The key debounce time varies with the value of system frequency. · Pull-high resistance Four kinds of key input pin pull-high resis- tance can be selected by mask option, namely, 20kW, 50kW, 100kW and 200kW. The resistance may vary with VDD, tem- peratures and the chip itself due to process variations. · Trigger mode All of the 12 keys can be optioned as one-shot trigger mode, level hold mode or level-trigger mode. ¨ One shot When one of the 12 keys (KEY1~KEY12) is pressed momentarily or held down, the group corresponding to that key will play once. ¨ Level trigger When one of the 12 keys is pressed and held down, the corresponding group will keep playing. Once the pressed key is released, the group will not stop till the included sec- tions are all completed. * Level hold When one of the 12 keys is pressed and held down, the group corresponding to that held key will play until the pressed key is re- leased, then the group will immediately stop regardless of the rest. FLAG When voices are playing, both FLAG1 and FLAG2 pins are activated to output one of the following signals through code option. FLAG1 can be optioned as one of the following signal outputs: None, 3HzB flash, Busy, 6HzB flash, Voice indica- tor, or End-pulse output FLAG2, on the other hand, can be set as one of the following signal outputs: None, 3Hz flash, 6Hz flash, or Busy output · 3Hz/3HzB flash When voices are playing, the FLAG1 as well as FLAG2 pin outputs a 3Hz signal to drive an LED. The signal is active low, 25% duty. Once the voice output is terminated, the FLAG1 and FLAG2 pins become floating out- puts. When the FLAG1 and the FLAG2 pins are optioned as 3HzB and 3Hz outputs, they will be alternately output at a 3Hz rate. G rou p N G rou p N G rou p N KEY N AU D AU D FL A G : F l oat i n g G rou p N G rou p N G rou p N KE Y N AU D G rou p N G rou p N KE Y N AU D |
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