stmpe1801 STMicroelectronics, stmpe1801 Datasheet - Page 46

• Manufacturer Part Number: stmpe1801
• Description: Xpander Logic? 18-bit Enhanced Port Expander With Keypad Controller
• Manufacturer: STMicroelectronics

Keypad controller
11.3
Note:
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Data registers
The KPC_DATA register contains five bytes of information. The first three bytes store the key
coordinates and status of any three keys from the normal key matrix, while the fourth byte
stores the status of special function keys and the fifth byte consists of the status of
dedicated keys.
When accessing the KPC DATA FIFO, it is mandatory to read all five bytes of KPC_Data
registers together consecutively.
Doc ID 17884 Rev 3
STMPE1801