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AP8821 Datasheet(PDF) 4 Page - Aplus Intergrated Circuits |
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AP8821 Datasheet(HTML) 4 Page - Aplus Intergrated Circuits |
4 / 13 page Integrated Circuits Inc. aP8821 4 Output Selections There are three independent output pins OUT1, OUT2 and OUT3, available for four combinations of LED1, LED2, STOP and BUSY signals for each voice group. OUT1 OUT2 OUT3 1. LED2 LED1 BUSY 2. STOP LED1 LED2 3. LED1 BUSY STOP 4. LED1 BUSY /BUSY LED1 and LED2 are complemented outputs flashing at a fix interval. STOP pulse gives a long enough positive pulse at the end of the playback for each group with option to enable or disable it. BUSY is active high depends on voice Block setting. That means BUSY signal can be set to high when some voice Blocks are being played but set to low for the others. Software Support All those Options and Output selections can be set with a dedicated OTP compiler and programmer software supplied by APLUS. Key trigger mode and CPU trigger mode In Key trigger mode, S1 to S4 will trigger four voice groups. The rest of the voice groups can only be triggered by SBT sequential trigger pin. In CPU trigger mode, binary data is input to S4~S1. A high pulse is input to SBT pin with pulse width equal to or longer than the debounce time to strobe the data to initial the playblack. Data patterns “1110” and “1111” is not allowed. Group-n S4 S3 S2 S1 Group-n S4 S3 S2 S1 Group1 0 0 0 0 Group9 1 0 0 0 Group2 0 0 0 1 Group10 1 0 0 1 Group3 0 0 1 0 Group11 1 0 1 0 Group4 0 0 1 1 Group12 1 0 1 1 Group5 0 1 0 0 Group13 1 1 0 0 Group6 0 1 0 1 Group14 1 1 0 1 Group7 0 1 1 0 X 1 1 1 0 Group8 0 1 1 1 X 1 1 1 1 |
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