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TDA7529 データシート(PDF) 30 Page - STMicroelectronics |
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TDA7529 データシート(HTML) 30 Page - STMicroelectronics |
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30 / 60 page  Tuning state machine TDA7529 30/60 5.1.3 Mode 010: search Figure 9. Search timing diagram This mode is used to jump to a different frequency and stay there, with audio muted. AFSAMPLE can be used to tell the back-end when to mute the audio output. AFHOLD can be used to tell the back-end to switch to faster time constants for quick quality acquisition. 5.1.4 Mode 011: AF update Figure 10. AF update timing diagram This mode is used to jump to an AF frequency, check its quality, jump back to the starting frequency and continue reception. AFSAMPLE can be used to tell the back-end when to acquire the AF frequency quality. AFHOLD can be used to tell the back-end to mute/unmute the audio and keep normal processing on hold. EVENTS TIME transmission with subaddr. bit 7 = 1 wait T1ms wait for Tplllock wait 50 us AFSAMPLE AFHOLD B.E. OPERATION mute audio quality dets in fast mode bus STOP event regs swap AC00046 EVENTS TIME transmission with subaddr. bit 7 = 1 AFSAMPLE AFHOLD B.E. OPERATION mute audio hold unmute audio bus STOP event regs swap regs swap freeze AF qual AC00047 |
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