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HT813D0 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT813D0 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 12 page  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>......KEY7>KEY8 • Key debounce time There are four kinds of key-in debounce time to be selected by mask option, namely, 700 µs, 22ms, 45ms and 180ms. 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, 20k Ω, 50kΩ, 100kΩ and 200kΩ. The resistance may vary with VDD, tem- peratures and the chip itself due to process variations. • Trigger mode All of the eight keys can optioned as one-shot trigger mode or level-trigger mode. ♦ One shot When one of the eight keys (KEY1~KEY8) is pressed momentarily or held down, the group corresponding to that key will play once. ♦ Level trigger When one of the eight keys is pressed and held down, the corresponding group will keep playing. Once the pressed key is re- leased, the group will not stop till the in- cluded 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: None, 3HzB flash, Busy, 6HzB flash, Voice indica- tor, or End-pulse output FLAG2, on the other hand, can be set as one of the following signal outputs: None, 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 an 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 be alternately output at a 3Hz rate. • 6Hz/6HzB flash When voices are playing, the FLAG1 pin outputs a 6Hz signal to drive an LED. The signal is active low, 25% duty. Once the voice output is terminated, the FLAG1 pin be- comes a floating output. When the FLAG1 and the FLAG2 pins are optioned as 6HzB and 6Hz outputs, they will be alternately output at a 6Hz rate. HT813D0 7 5th May ’98 |
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