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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
Figure 3.13.1 Block Diagram and System Integration of the KPD
Features of the Keypad Interface Controller
• Synchronous to bus
• 32 bit AHB bus interface
• 32.768 kHz sample clock
• Debouncing process (0 to 100 ms, 10 ms resolution) duration programmable by controller
• Module sends an interrupt, whenever a change occurs
• Up to 8 rows and 8 columns of a standard keypad matrix possible
• Up to 8 additional keys connected to ground possible
• Pressed key (or combination of pressed keys) and duration (0 to 1 s, 10 ms resolution) stored within keypad
registers
• Rescan (0 to 100 ms, 10 ms resolution) to determine that pressed key(s) still the same.