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HT81R03 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT81R03 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
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6 / 11 page  HT81003/HT81R03 6 July 24, 2000 Preliminary the playing order of the sections in the groups. Notice that the total amount of sections in- cluded in the groups should be less than 256 which is the space limitation of the function ta- ble ROM. · KEY1 as a direct key Each key is mapped to a group in the function table. If a key is not used, the group mapped to that key is a piece of silence. The following is an example of the function table: Group 1 sec.1 + sec.2 + sec.3 + sec.4 Group 2 sec.3 As illustrated in the table, voice ROM is com- posed of 4 sections, and 5 sections for the function table. If KEY1 is momentarily trig- gered, section 1, section 2, section 3 and sec- tion 4 are played in sequence and then stopped. Triggering KEY2 plays section 3. · KEY1 as a sequential key When KEY1 is optioned as a sequential key, it can include multiple groups (sub-groups) in the function table. However, KEY2 is used as a direct key exclusively and comprise of only one group in the function table. An example is shown below: Group 1-1 sec.4 + sec.2 Group 1-2 sec.1 + sec.3 : : : : Group 1-N sec.2 + sec.3 Group 2 sec.2 + sec.3 As indicated in the above table, KEY1 can be made up of sub-groups. The corresponding sub-groups is played in sequence each time KEY1 is triggered. ¨ 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 ..... ¨ Reset of KEY1 playing sequence If a sub-group of KEY1 group is being played and KEY2 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, 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 - retriggerable - minimum key debounce time (@1.2ms, fOSC=2MHz) 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 a selection of KEY1 sub-groups more easy, KEY2 should be programmed as silence. Then this silence key has to be triggered to re- set KEY1. By so doing, the playing sub-group of KEY1 is directly specified by the pulse number applied to KEY1 (see Figure 2). · KEY2 as a stop key (by mask option) When KEY2 functions as a stop key, any voice output can be stopped by pressing KEY2. G r oup 1- 1 G r oup 1- 2 G r oup 1- N G r oup ( 2 ~ 8 ) G r oup 1- 1 KE Y1 KE Y2 AU D Figure 1. Reset of KEY1 playing sequence |
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