Manual

MAX7359
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
XXXXXX
FIFO is empty. 0 0 111111
FIFO is overflow. Continue to read data in FIFO. 0 1 111111
Key 63 is pressed. Read one more time to determine
whether there is more data in FIFO.
10111111
Key 63 is released. Read one more time to determine
whether there is more data in FIFO.
11111111
Key repeat. Indicates the last data in FIFO. 0 0 111110
Key repeat. Indicates more data in FIFO. 0 1 111110
Key 62 is pressed. Read one more time to determine
whether there is more data in FIFO.
10111110
Key 62 is released. Read one more time to determine
whether there is more data in FIFO.
11111110
Table 3. Keys FIFO Register Format (0x00)