Samsung S5PC110 Manual page 1944

S5PC110_UM
Key Press Interrupt Occured
: S/W (ISR) proceed scanning
procedure
Pressed Key
(filtered view)
1st Row Key interrupt
: S/W(in ISR), pressed key is
detected (row, column)
1st Row Key
2nd Row Key
2nd Row Key interrupt
: S/W(in ISR) pressed key is detected.
S/W detect when the 1st Row Key pressed state.
Figure 8-6 Keypad Scanning Procedure when the two-key Pressed with Different Row
Key Release Interrupt Occured
: S/W (ISR) set flag (option)
1st Row Key 1st Row Key interrupt
pressed state : set to Released key state
2nd Row Key
pressed state
8 KEYPAD INTERFACE
2nd Row Key Interrupt
: set to Released key
state
8-7