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LCD lamp PWM
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Unknown, static VCC
Unknown, static GNC
PCM audio clock
PCM audio out
PCM audio L/R sync
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Pulse 4.16 KHz
LCD BUS ?
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USB
USB
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Rotary knob A
Rotary knob B
21
KEYBOARD SCAN MATRIX
KB row1/ GPG9
KB row2 / GPG10
KB row3 / GPG11
KB row0 / GPG8
P1
P2
P3
P4
P5
SHFT
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STBY
SEL
REPL
BACK
KB col2 / GPD10
KB col1 / GPD9
KB col0 / GPD8
row0
row1
row2
row3
col0
col1
col2
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
VCC
VCC
VCC
VCC
VCC
GND