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S3C6400X RISC MICROPROCESSOR
40
KEYPAD INTERFACE
Overview
The Key Pad Interface block in AP (S3C6400X) facilitates communication with external keypad devices. The
ports multiplexed with GPIO ports provide up to 8 rows and 8 columns. The events of key press or key release
are detected to the CPU by an interrupt. When any of the interrupt from row lines occurs, the software will scan
the column lines using the proper procedure to detect one or multiple key press or release.
It provides interrupt status register bits when key pressed or key released or both cases (when two interrupt
conditions are enabled). To prevent the switching noises, internal debouncing filter is provided.
Figure 40-1 Key Matrix Interface External Connection Guide
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.
KEYPAD INTERFACE
40-1
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