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UPD17006AGF-011 Datasheet(PDF) 38 Page - NEC |
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UPD17006AGF-011 Datasheet(HTML) 38 Page - NEC |
38 / 72 page 38 µPD17006AGF-011 4.1.1 PI (Program Identification) This RDS data is used to identify broadcasting programs. After the tuning operation has been completed, the same PI code is input two times or more, so that RDS data having the same PI code is decoded. The PI counter is incremented up to eight counts. If RDS data having different PI codes are input, the PI counter is decremented, and those RDS data are not decoded, unless they are TP or TA. When the PI counter has been decremented to zero, a differing PI code is judged to be the correct PI code, the PI counter is incremented, and when the PI counter become decremented two or more, the RDS data are decoded. Fig. 4-1 shows the operation of the PI counter. Fig. 4-1 PI Counter Operation 1 : End of tuning 2 : Inputs PI code to comparison PI code area. Counter + 1 3 : Compares PI code with comparison PI code. PI codes coincide. Counter + 1 4 : Compares PI code with comparison PI code. PI codes coincide. Counter + 1. RDS data decoded. 5 : Compares PI code with comparison PI code. PI codes do not coincide. Counter – 1. PI counter 7 (MAX) 0 1 2 3 4 4 4 4 4 4 4 5 4 5 5 5 5 5 5 5 2 3 4 4 |
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