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PRELIMINARY
KEYPAD INTERFACE
S3C6400X III RISC MICROPROCESSOR
40-6
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Key Press Interrupt Occured
: S/W (ISR) proceed scanning
procedure
Key Release Interrupt Occured
: S/W (ISR) set flag (option)
1st Row Key interrupt
: S/W(in ISR), pressed key is
detected (row, column)
2nd Row Key
pressed state
1st Row Key interrupt
: set to Released key state
2nd Row Key interrupt
: S/W(in ISR) pressed key is detected.
S/W detect when the 1st Row Key pressed
state.
2nd Row Key Interrupt
: set to Released key
state
1st Row Key
pressed state
Pressed Key
(filtered view)
1st Row Key
2nd Row Key
Figure 40-6 Keypad Scanning Procedure when the two-key pressed with different row