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UPD9930 Datasheet(PDF) 39 Page - Renesas Technology Corp |
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UPD9930 Datasheet(HTML) 39 Page - Renesas Technology Corp |
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39 / 80 page  µPD9930 37 Register address 01 10 TXACT TNACT SOACT SIACT DSPCR TXACT 1 = ON Note TNACT 1 = ON Digital signal processor BPF LPF Tone generator DSP I/F SOACT 1 0 DGND DGND SIACT 0 1 SO SI A/D D/A 4.2 DIGITAL INPUT/OUTPUT CONTROL An outline of digital input/output control is shown in Figure 4-5. The µPD9930 can control input and output of the digital signal processor as follows. Digital input/output control Registers used Voice send data BPF operation processing execution/stop Connection and disconnection to tone output Voice send/ Digital signal processing control register receive system (DSPCR) Serial output terminal (SO) control Serial input terminal (SI) control Caution You must not connect nor disconnect tone output voice send/receive system in the tone operation. It causes malfunction. Figure 4-5 Digital Input/Output Control Note Connected when TXACT = 0 and TNACT = 1. |
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