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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HT815D0 bảng dữ liệu(PDF) 8 Page - Holtek Semiconductor Inc |
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HT815D0 bảng dữ liệu(HTML) 8 Page - Holtek Semiconductor Inc |
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8 / 15 page  HT815D0 8 March 15, 2000 That KEY1 functions as a random key is a special case of sequential key, which combines a particu- lar 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 by retriggering KEY1. In other words, the KEY1 playing sequence is reset whenever a key other than KEY1 is triggered (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. 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 keys 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-trigger mode or level hold 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. G rou p N G rou p N KE Y N AU D |
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