Samsung S3C6400X User Manual page 1144

KEYPAD INTERFACE
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 40-6 Keypad Scanning Procedure when the two-key pressed with different row
Preliminary product information describe products that are in development,
40-6
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
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
S3C6400X III RISC MICROPROCESSOR
2nd Row Key Interrupt
: set to Released key
state