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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
4.4.1 Fixed keyboard
The fixed keyboard is scanned every 10 milliseconds. For debouncing, the same situation must be
detected 3 times before it is accepted.
P1
P3
P4 /
AMS
P2
P6 /
DOLBY
P5 /
MTL
AUTO/
MAN
LOCAL/
DX
MODE
VOL
DOWN
FREQ
DOWN
PRE DOWN/
DOLBY
VOL UPFREQ. UP
STEREO
PRE UP/
MTL
SEL. DISP.
POWER
SELECTMUTE
BAND
AST
TA
PTY
CCR612S
P2.1 KEYB1
P2.2 KEYB2
P2.3 KEYB3
P2.4 KEYB4
P2.5 KEYB5_FSCL
P2.6 KEYB6_FSDA
P2.0 KEYB0
18
19
20
21
23
22
24
LOUD/
RESET
AF/
REG
SCAN
Freq down Previous track/ Fast reverse
Freq up Next track / Fast forward
Preset down Disc down
Preset up Disc up
Scan Intro scan/ Disc scan
P2 Disc down
P3 Disc up
P4 Shuffle disc/ Shuffle all
P5 Repeat track/ Repeat disc
P6 Intro scan/ Disc scan
Figure 6 Fixed keyboard
4.4.2 Detachable keyboard
The detachable keyboard is scanned every 20 milliseconds (10 msec. for the small fixed keyboard). For
debouncing, the same situation must be detected 2 times (3 times for the small fixed keyboard) before it
is accepted.
The microcontroller will automatically detectthat the detachable front is removed, andwill switch the radio
off. Placing the front on the radio does not cause the radio to switch on.
40