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14.1 Overview
The keypad port (KPP) is a 16-bit peripheral which can be used either for keypad
matrix scanning or as general-purpose I/O. The block diagram of the KPP is shown in
Figure 14-1.
To Interrupt
Controller
KPSR
256 Hz
Row Enable
Controls (KPCR)
MMC2001
REFERENCE MANUAL
All manuals and user guides at all-guides.com
Freescale Semiconductor, Inc.
SECTION 14
KEYPAD PORT
Data Direction (KDDR) and
Open Drain Enable (KPCR) Controls
KDDR[15:8]
KPCR[15:8]
KDDR[7:0]
Figure 14-1 KPP Block Diagram
KEYPAD PORT
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KPDR[15:8]
Keypad Matrix
Up to 8 x 8
Pad Drivers
Pull-up/Data Direction
Controls (KDDR)
MOTOROLA
14-1
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