MAX7359 Maxim, MAX7359 Datasheet - Page 8

• Manufacturer Part Number: MAX7359
• Description: The MAX7359 I²C interfaced peripheral provides microprocessors with management of up to 64 key switches
• Manufacturer: Maxim

2-Wire Interfaced Low-EMI
Key Switch Controller/GPO
Table 3. Keys FIFO Register Format (0x00)
8
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 is empty.
FIFO is overflow. Continue to read data in FIFO.
Key 63 is pressed. Read one more time to determine
whether there is more data in FIFO.
Key 63 is released. Read one more time to determine
whether there is more data in FIFO.
Key repeat. Indicates the last data in FIFO.
Key repeat. Indicates more data in FIFO.
Key 62 is pressed. Read one more time to determine
whether there is more data in FIFO.
Key 62 is released. Read one more time to determine
whether there is more data in FIFO.
_______________________________________________________________________________________
SPECIAL FUNCTION
empty
FIFO
flag
D7
0
0
1
1
0
0
1
1
release
Key
flag
D6
0
1
0
1
0
1
0
1
D5
KEYS FIFO REGISTER DATA
X
1
1
1
1
1
1
1
1
D4
X
1
1
1
1
1
1
1
1
D3
X
1
1
1
1
1
1
1
1
D2
X
1
1
1
1
1
1
1
1
D1
X
1
1
1
1
1
1
1
1
D0
X
1
1
1
1
0
0
0
0