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HT818D0 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT818D0 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 14 page  HT818D0 7 March 15, 2000 That KEY1 functions as a random key is a special case of sequential key, which com- bines a particular arrangement of sub-group playing sequence. ¨ Reset of KEY1 playing sequence If a sub-group of KEY1 group is being played and one of KEY2~KEY12 is triggered, the playing sub-group will be terminated, and the newly triggered key group is played in- stead. The first sub-group will start playing when KEY1 is retriggered. In other words, the KEY1 playing sequence is reset when- ever a key other than KEY1 is triggered (see Figure 1). ¨ 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 applied 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 or 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. G rou p 1 - 1 G rou p 1 - 2 G rou p 1 - N G rou p ( 2 ~ 1 2) G rou p 1 - 1 KE Y1 KE Y2 ~ KEY 1 2 AU D Figure1 Reset of KEY1 playing sequence G rou p 1 - N N p u l s e G rou p 1- M M p u l s e KE Y1 KE Y2 ~ KEY 1 2 ( S i l enc e) AU D Figure 2 KEY1 sub-group selection |
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