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HT813D0 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT813D0 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 12 page  ♦ The playing sequence of sequential KEY1 is: Group 1-1 → Group 1-2 → Group 1-3 ..... → Group 1-N (the last group) → Group 1-1 ..... ♦ The playing sequence of random KEY1 is: Group 1-3 → Group 1-5 ..... → Group 1-N → Group 1-3 → Group 1-5 ..... That KEY1 functions as a random key is a special case of sequential key, which combines a particular arrangement of sub-group play- ing sequence. ♦ Reset of KEY1 playing sequence If a sub-group of KEY1 group is being played and one of KEY2~KEY8 is triggered, the playing sub-group will be terminated, and the newly triggered key group come is played instead. The first sub-group will start play- ing by retriggering KEY1. 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 follow- ing ways: – sequential or random – retriggerable – minimum key debounce time ( ≅700µs, 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 selection of KEY1 sub-groups more easily, one of KEY2~KEY8 should be pro- grammed 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). • KEY8 as a stop key (by mask option) When KEY8 functions as a stop key, any voice output can be stopped by pressing KEY8. • KEY1~KEY7 as a repeat key KEY1~KEY7 all function as repeat key if one of the seven keys is set as a repeat key. In o ther words, once the mode of one of KEY1~KEY7 is determined, the remaining six keys are set accordingly. As a repeat key, the sections included can be played sequentially and repeatedly till other key input is triggered. KEY8 has no other choice but functions as a stop key when KEY1~KEY7 are set as repeat keys. Figure 2 KEY1 sub-group selection Figure 1 Reset of KEY1 playing sequence HT813D0 6 5th May ’98 |
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