Samsung S3C6400X User Manual page 1143

S3C6400X RISC MICROPROCESSOR KEYPAD INTERFACE
Figure 40-4 Keypad scanning procedure II
Figure 40-5 Keypad scanning procedure III
Preliminary product information describe products that are in development,
40-5
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.