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MAX7359 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX7359 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 20 page 2-Wire Interfaced Low-EMI Key Switch Controller/GPO 8 _______________________________________________________________________________________ KEYS FIFO REGISTER DATA SPECIAL FUNCTION D7 D6 D5 D4 D3 D2 D1 D0 The key number indicated by D5:D0 is a key event. D7 is always for a key press of key 62 and key 63. When D7 is 0, the key read is the last data in the FIFO. When D7 is 1, there is more data in the FIFO. When D6 is 1, key data read from FIFO is a key release. When D6 is 0, key data read from FIFO is a key press. FIFO empty flag Key release flag XX XX XX FIFO is empty. 0 0 1111 1 1 FIFO is overflow. Continue to read data in FIFO. 0 1 1111 1 1 Key 63 is pressed. Read one more time to determine whether there is more data in FIFO. 10 1 1 1 111 Key 63 is released. Read one more time to determine whether there is more data in FIFO. 11 1 1 1 111 Key repeat. Indicates the last data in FIFO. 0 0 1111 1 0 Key repeat. Indicates more data in FIFO. 0 1 1111 1 0 Key 62 is pressed. Read one more time to determine whether there is more data in FIFO. 10 1 1 1 110 Key 62 is released. Read one more time to determine whether there is more data in FIFO. 11 1 1 1 110 Table 3. Keys FIFO Register Format (0x00) |
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