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SN66012B Datasheet(PDF) 4 Page - SONiX Technology Company |
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SN66012B Datasheet(HTML) 4 Page - SONiX Technology Company |
4 / 11 page SN66012B 4-Channel Speech Controller 5.5. Sampling Rate Counters 4 independent sampling rate counters are dedicated to 4 individual voice channels to play voices with different playing rates. The playing rate is programmable from 4KHz to 40KHz. The resolution of sampling period of each sampling rate counter is 0.25 uS. This feature helps SN66012B play sounds with accurate pitches in the case of music instrument synthesis. 5.6. Auto repetition Auto repetition function helps SN66012B realize a “looping” sound automatically by hardware without any software effort. Auto repetition function is a very useful mechanism to implement “Sustain” sound in instrument synthesis. All 4 channels are equipped with this function. Arbitrary lengths of looping sound are accepted by SN66012B. 5.7. I/O Ports P1 is a 4-bit input port, P2/P3 are two 4-bit I/O ports and P4 is a 4-bit output port. Any bit of P2 and P3 can be programmed to be input or output individually. Any valid data transition (H L or L H) of P1, P2 and P3 can reactivate the chip when it is in power-down stage. To Internal Data Bus Read Control PAD Weak Input Port Configuration (P10~P13) Ver: 1.1 December 6, 2004 4 |
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