Samsung S5PC110 Manual page 1943

S5PC110_UM
S5PC110X
I
interrupt generated and knows
which "row" is pressed
SCAN_X[0]
H
Key Pressed
H
( Short)
H
H
H
H
H
L
H
H
H
H
H
H
H
SCAN_X[13]
SCAN_Y[0]
L
L
L
L
L
L
L
L
SCAN_Y[7]
Figure 8-4
Figure 8-5
S5PC110X
SCAN_X[0]
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
SCAN_X[13]
H
H
H
H
H
H
H
H
Keypad Scanning Procedure II
Keypad Scanning Procedure III
8 KEYPAD INTERFACE
Read KEYIN register
: All High if not matched
Scan Procedure (S/W)
: make one output LOW, the
others HIGH and Read KEYIN
SCAN_Y[0]
SCAN_Y[7]
8-6