PD17012GF-055_15 Datasheet, PDF (36/84 Pages) Renesas Technology Corp – SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR CAR-MOUNTED FM/MW/LW RADIO

µPD17012GF-055
5.2 RDS Data Processing
The µPD17012GF-055 contains an RDS data decoder part.
The µPD17012GF-055 uses the following six types of data:
(1) PI (Program Identification)
(2) PS (Program Service Name)
(3) PTY (Program Type)
(4) AF (Alternative Frequency)
(5) TP (Traffic Program Identification)
(6) TA (Traffic Announcement Identification)
5.2.1 PI (Program Identification)
This data is used for program identification.
After a tuning operation is completed, receipt of the same PI code two or more times causes the RDS data that
has that PI code to be decoded. The PI counter can be incremented up to four counts.
When RDS data of a different PI code is received, the PI counter is decremented. RDS data other than TP and
TA at this time are not decoded.
If the PI counter is decremented to zero, the different PI code is judged to be a new correct PI code, thus
incrementing the PI counter; when the maximum count of the PI counter is reached two or more times, the RDS data
is decoded.
Figure 5-2. PI Counter Operation
PI counter
4 (MAX)
↑↑
44
↑
4
↑
4
0
↑
1
↑
3
↑
2
↑↑↑
545
↑
5
↑
5
↑↑
52
1 : Tuning operation end
2 : The PI code is entered in the PI code area for comparison. Counter + 1
3 : The PI code is compared with the PI code. Counter + 1 when the two codes are the same.
4 : The PI code is compared with the PI code. Counter + 1 when the two codes are the same.
RDS data is decoded.
5 : The PI code is compared with the PI code. Counter – 1 when the two codes are different.
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