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HT81R09 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT81R09 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 19 page  HT81XXX Rev. 1.40 11 March 1, 2005 For a key group, some sections can be set as retriggerable and some as non-retriggerable. When a retriggerable section of a key group is playing, any key can be triggered to interrupt its playing. If it is a non-retriggerable section playing, any key interrupt is invalid. Group The EasyVoice TM plays groups according to the key in- put. A group can be made up of one or more sections. When a key is triggered, the corresponding group is played. For example, triggering KEY2 plays group 2, and so on. The same section is allowed to appear in dif- ferent groups. However, KEY1 can be made up of multi- ple groups when it is optioned as a sequential key. Otherwise, each key is composed by one group only. Key Function Table The voice ROM sections are played according to the in- structions of the key function table. The function table contains group information and the playing order of the sections in the groups. Notice that the total amount of sections included in the groups should be less than 256 which is the space limitation of the function table 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 composed of 4 sections, and 5 sections for the function table. If KEY1 is momentarily triggered, section 1, section 2, section 3 and section 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 in- clude multiple groups (sub-groups) in the function ta- ble. 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 ter- minated, 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 desired sub-group can be selected by controlling its corre- sponding pulse number. However, the features of KEY1 have to be set in the following 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 si- lence key has to be triggered to reset KEY1. By so do- ing, the playing sub-group of KEY1 is directly specified by the pulse number applied to KEY1 (see Figure 2). G r o u p 1 - 1 G r o u p 1 - 2 G r o u p 1 - N G r o u p ( 2 ~ 8 ) G r o u p 1 - 1 K E Y 1 K E Y 2 A U D Figure 1. Reset of KEY1 Playing Sequence |
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