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HT817D0 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc |
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HT817D0 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc |
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8 / 15 page  HT817D0 8 March 15, 2000 ¨ Reset of KEY1 playing sequence If a sub-group of KEY1is playing and one of KEY2~KEY12 is triggered, the playing sub-group will be terminated, and the newly triggered key group come into play instead. The first sub-group will start playing by retriggering KEY1. In other words, the KEY1 playing sequence is reset whenever a key otherthanKEY1istriggered(seeFigure1). ¨ Sub-group selection When KEY1 is triggered with pulses, a de- sired sub-group can be selected by controlling its corresponding pulse number. However, the features of KEY1 have to be set in the fol- lowing ways: - sequential or random - retriggerable - minimum key debounce time (@700ms, fOSC=96kHz) For instance, if sub-group 1-3 is the previous playing group, sub-group 1-5 will start playing after 2 pulses are input to KEY1, and so on. To make easy selection of KEY1 sub-groups, one of KEY2~KEY12 should be programmed as silence. Then this silence key has to be triggered to reset KEY1. By so doing, the playing sub-group of KEY1 is directly speci- fied by the pulse number applied to KEY1 (see Figure 2). · KEY12 as a stop key (by mask option) When KEY12 functions as a stop key, any voice output can be stopped by pressing KEY12. · KEY1~KEY11 as a repeat key KEY1~KEY11 all function as repeat key if one of the eleven keys is set as a repeat key. In other words, once the mode of one of KEY1~KEY11 is determined, the remaining 10 keys are set accordingly. As a repeat key, the sections included can be played sequentially and repeatedly till other key input is triggered. KEY12 has no other choice but functions as a stop key when KEY1~KEY11 are set as repeat keys. 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 the sys- tem 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. G rou p N G rou p N KE Y N AU D G rou p N G rou p N G rou p N KE Y N AU D |
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