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HT812D0 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT812D0 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 15 page  As stated on the table, KEY1 can be made up of sub-groups. The corresponding sub-groups is played in sequence each time KEY1 is trig- gered. ♦ 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 the keys from KEY2~KEY4 is triggered, the playing sub-group will be ter- minated, and the newly triggered key group is played instead. The first sub-group will start playing by retriggering KEY1. In other words, the KEY1 playing sequence is reset whenever a key other than KEY1 is trig- gered (see Figure 1). ♦ Sub-group selection When KEY1 is triggered with pulses, the de- sired sub-group can be selected by controlling its corresponding pulse number. The features of KEY1 have to be set in the following 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 easy selection of KEY1 sub-groups, one of KEY2~KEY4 should be programmed as silence. Then this silence key has to be trig- gered to reset KEY1. By so doing, the playing sub-group of KEY1 is directly specified by the pulse number applied to KEY1 (see Figure 2). • KEY4 as a stop key (by mask option) When KEY4 functions as a stop key, any voice output can be stopped by pressing KEY4. • KEY1~KEY3 as a repeat key KEY1~KEY3 all function as repeat key if one of the three keys is set as a repeat key. In o ther words, once the mode of one of KEY1~KEY3 is determined, the remaining two keys are set accordingly. As a repeat key, the sections included can be played sequentially and repeatedly till other trigger is applied. KEY4 functions as a stop key when KEY1~KEY3 are set as repeat keys. Figure 1 Reset of KEY1 playing sequence Figure 2 KEY1 sub-group selection HT812D0 6 5th May ’98 |
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