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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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HT81003 bảng dữ liệu(PDF) 7 Page - Holtek Semiconductor Inc |
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HT81003 bảng dữ liệu(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 11 page  HT81003/HT81R03 7 July 24, 2000 Preliminary · KEY2 as a repeat key As a repeat key, the sections included can be played sequentially and repeatedly until other key input is triggered. Key features · Key priority When two keys are triggered simultaneously, the output voice is determined by the key pri- ority as shown below: KEY1>KEY2 · Key debounce time There are three kinds of key-in debounce time to be selected by mask option, namely, 1.2ms, 22ms, 45ms. The key debounce time varies with the value of the system frequency. · Pull-high resistance Four kinds of key input pin pull-high resis- tance can be selected by mask option, namely, 0kW, 50kW, 100kW and 200kW. The resistance may vary with VDD, tempera- tures and the chip itself due to process vari- ations. · Trigger mode The two keys can optioned as one-shot trigger mode or normal mode. ¨ One shot When one of the two keys (KEY1, KEY2) is pressed momentarily or held down, the group corresponding to that key will play once. ¨ Normal trigger When one of the two keys is pressed and held down, the corresponding group will continue playing. Once the pressed key is released, the group will not stop until the included sections are all completed. FLAG When voices are playing, both FLAG1 and FLAG2 pins are activated to output one of the following signals through code option. FLAG1 can be optioned as one of the following signal outputs: OFF, 3HzB flash, Busy, 6HzB flash, 3hz, 6Hz or End-pulse output FLAG2, on the other hand, can be set as one of the following signal outputs: OFF, 3Hz flash, 6Hz flash, or Busy output · 3Hz/3HzB flash When voices are playing, FLAG1 as well as FLAG2 pin outputs a 3Hz signal to drive a LED. The signal is active low, 25% duty. Once the voice output is terminated, the FLAG1 and FLAG2 pins become floating outputs. When the FLAG1 and the FLAG2 pins are optioned as 3HzB and 3Hz output, they will alternately output at a 3Hz rate. G r oup 1- N N pul s e G r oup 1- M M pul s e KEY1 KE Y2 ( S ile nc e ) AU D Figure 2. KEY1 sub-group selection G r oup N G r oup N KE Y N AU D G r oup N G r oup N G r oup N KE Y N AU D |
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