Samsung S5PC110 Manual page 1945

S5PC110_UM
FLT_ CLK
OSCIN clock( 12MHz )
Or USB_XTI(48 MHz)
Interrupt
to INTC
APB bus
Interface
KEYIFFC
(10 - bit
Counter )
FC _EN
...
Positive
One pulse,
( keypress,
Keyrelease )
INT _ R_ EN
INT _F _ EN
control
signals
SFR Write / Read
Figure 8-7 Keypad I/F Block Diagram
Debouncing Filter
: 2 - filter clock
WAKEUP _ INT_EN
SCAN _ X[ 13 :0 ]
KEYFLT0
KEYFLT1
KEYFLT2
.
.
KEYFLT3
.
.
KEYFLT4
.
KEYFLT5
.
KEYFLT6
KEYFLT 13
SCAN _Y [ 7 :0 ]
8 KEYPAD INTERFACE
KEY _ WAKEUP _ INT
( from ALIVE block )
8-8