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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
Pins 18 to 24 of CCR612 with fixed front.
Pin Name I/O Type Description
18 KEYB0 I/O IP 1 Line of the triangular keyboard matrix
19 KEYB1 I/O IP 1 Line of the triangular keyboard matrix
20 KEYB2 I/O
I
IP 1 Line of the triangular keyboard matrix
Option diode for tuning grid and band limits (USA / Europe
option)
21 KEYB3 I/O
I
IP 1 Line of the triangular keyboard matrix
Option diode for available bands.
22 KEYB4 I/O IP 1 Line of the triangular keyboard matrix
23 KEYB5 I/O IP 1 Line of the triangular keyboard matrix
24 KEYB6 I/O IP 1 Line of the triangular keyboard matrix
The fixed keyboard (See Figure 6) is scanned every 10 milliseconds. To scan the keyboard, the lines are
made low - one at a time - and then the state of the other lines are read. For debouncing, a keypress must
be detected 3 times before it is accepted.
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