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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
6.2.6 AST search
To start an AST (Automatic Store Tuning) search, press the AST key until the radio bleeps (2 seconds).
Now, the following actions are taken:
1. If the radio is not in an AST band, it switches to the relevant AST band
FM-1, FM-2 -> FM-AST
MW -> MW-AST
AST is not available in the LW and SW bands.
2. The 6 strongest stations will be stored in the NVM, ignoring TA mode. The whole band is scanned
for transmitters, a maximum of two sweeps will be made, one in Local mode and if necessary one
in Dx mode). If less than 6 stations were found, the last preset memory locations are not replaced.
3. Preset-1 is selected.
During the whole process, the radio is muted and the message "STORE" is shown on the display unless
the radio is in CD-changer / External / Cassette Mode.
6.2.7 The LOCAL/DX key
The user can control the search sensitivity of the radio via the so called Local/Dx feature. In Local mode,
the radio willonly stop at strong stations. InDx mode, a searchaction will also stop atweaker stations. The
Local/Dx status is displayed via an icon. After power on, the radio will always go in Dx mode.
When the radio is in search tuning mode the tuner Local/Dx status depends on the Local/Dx setting. As
soon as the radio is in stable tuning condition the tuner attenuator status will be Dx.
6.3 CD-Changer, Cassette and external source interface
CCR612 is equipped with five different audio sources (radio, CD-changer, cassette, external plug and
bleep) each source is associated with a corresponding mode. Only one source can be selected at a time.
Source selection is accomplished by the sofac or by source select pins in case no sofac is installed.
Source switching can be invoked in two ways. The first way is pushing the MODE key, this will result in
toggling through all available sources(Radio, CD-changer, Cassette, External plug, Radio). Furthermore
an external event can invoke the source switching ( see Figure 14). The following external events are
possible: insert cassette, eject cassette, insert external plug and remove external plug.
Automatic selections can be overruled by the MODE key.
When the radio is switched off, the source select state is stored in NVM. The same state is selected again
when the radio is switched on.
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