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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
7 RDS / RBDS FACILITIES.
As soon as the radio is steadily tuned to an FM station, it will start collecting RDS information. The next
items are extracted from the stream of RDS data:
- PI Programme Identification code;
- PS Programme Service name;
- PTY Programme TYpe code;
- TP Traffic Programme bit;
- TA Traffic Announcement bit;
- AF Alternative Frequency list;
- EON Enhanced Other Network information.
Most data is validated, e.g. the same data must be received twice before it is accepted as a new value.
7.1 Programme Identification code
The PI code is invisible for the user. It is used to check whether the correct station is received after a
preset is selected, or when the AF follow mechanism switches to an alternative frequency.
When a station is stored in NVM, also its PI code is stored. When the same preset is selected again, the
radio verifies the PI code. If the PI code is not correct, and AF follow mode is on, the radio will search for
a station with the right PIcode, first by scanning all available alternative frequencies, then ifafter a timeout
of 6 seconds the PI code is still not correct, a search tuning operation is started.
During AST Search, the PI code is used to avoid that the same programme is stored at different presets,
when it can be received on more than one frequency. For USA application (RBDS) the regional function
will only work for PI codes above B000
hex
. PI codes below B000
hex
do not have regional variants. AF
switching is only allowed to stations with exactly the same PI code.
7.2 Programme Service name
By default, the radio will display the received Programme Service name as soon as it is available. The PS
name is stored in the preset memory locations. The name is then immediately displayed when a preset
station is selected.
Tuning frequency instead of PS name is displayed when the radio is in manual tuning mode. Also, by
means of the display key, the radio can be forced to display PTY code, frequency and PS name
respectively.
7.3 Programme TYpe
PTY is a code for the kind of programme that is broadcast. Figure 17 shows the names of PTY codes that
are defined for RDS. CCR612 can display the PTY currently received, and it can search for a station with
a specific PTY code. The user can select a PTY code and start a scan for a station transmitting this PTY
code.
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