Kenwood KDC-BT7539U Service Manual page 13

MICROCOMPUTER'S TERMINAL DESCRIPTION
Pin No. Pin Name I/O
48 LED CONT TRI I/O Triangle LED luminescence SW
49,50 NC -
51 SDA I/O Data transmission and reception for ROM correction
52 SCL I/O Clock for ROM correction
53~55 NC -
56 ROTALY2 CW I
57 ROTALY2 CCW I
58 ROTALY1 CW I
59 ROTALY1 CCW I
60 VCC2 -
61 NC -
62 VSS -
63~70 NC -
71 SC CON I
72 NC -
73 KR2 I
74 KR1 I
75 NC -
76 KS1 I/O Key scan output
77 KS2 I/O Key scan output
78 KS3 I/O Key scan output
79 KS4 I/O Key scan output
80 KS5 I/O Key scan output
81~90 NC -
91 SA RST O
92 SA CLK O
93 SA IN I
94 AVSS -
95 NC -
96 VREF -
97 AVCC -
98~100 NC -
Truth value table
q KEY MATRIX
KR1 (Pin 74)
KS1 (Pin 76) TI
KS2 (Pin 77) MENU
KS3 (Pin 78) AUDIO
KS4 (Pin 79) ATT
KS5 (Pin 80) N/A
Application
Not used
Not used
Rotary (Multi key) B input
Rotary (Multi key) A input
Rotary (VOL) B input
Rotary (VOL) A input
Power supply (5V)
Not used
GND
Not used
System μ-COM communication
Panel operation control
Not used
Key return input
Key return input
Not used
Not used
Reset output for spectrum analyzer
Clock output for spectrum analyzer
Data input for spectrum analyzer
GND
Not used
A/D analog reference voltage
Power supply (5V)
Not used
KR2 (Pin 73)
AM
<<
PLAY
>>
FM
KDC-BT7539U/BT8041U
/BT8141UY/BT838U
Truth
Processing Operation Description
value table
H: LED ON, Hi-Z: LED OFF
Output L fi xed
Output except when data is read
Output except when clock data is read
Output L fi xed
Pulse width detection
1-pulse/2-click, 15-pulse/360°
Pulse width detection
1-pulse/2-click, 15-pulse/360°
Pulse width detection
1-pulse/2-click, 15-pulse/360°
Pulse width detection
1-pulse/2-click, 15-pulse/360°
Connects PAN5V
Output L fi xed
Output L fi xed
H: Panel operated,
L: Panel operation stopped
Output L fi xed
q
q
Output L fi xed
q Switches between output-L and Hi-Z
q Switches between output-L and Hi-Z
q Switches between output-L and Hi-Z
q Switches between output-L and Hi-Z
q Switches between output-L and Hi-Z
Output L fi xed
H: Reset released, L: Reset
Output L fi xed
Connects PAN5V
Connects PAN5V
Output L fi xed
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