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PRELIMINARY
KEYPAD INTERFACE
S3C6400X III RISC MICROPROCESSOR
40-2
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.
DEBOUNCING FILTER
The debouncing filter is supported for keypad interrupt of any key input. The filtering width is approximately
62.5usec (“FLT_CLK” two-clock, when the FLT_CLK is 32 KHz). The keypad interrupt (key pressed or key
released) to the CPU is an ANDed signal of the all row input lines after filtering.
FILTER_IN
FILTER_OUT
Filter width : FCLK two-clock
Filter Clock(FCLK) is a FLT_CLK or the division of that clock.
FLT_CLK is come from System Controller, RTCCLK(32Khz) or
OSCIN(ex:12Mhz)
Figure 40-2 Internal Debouncing Filter Operation