MAX7370 Maxim, MAX7370 Datasheet - Page 20

• Manufacturer Part Number: MAX7370
• Description: The MAX7370 I²C-interfaced peripheral provides microprocessors with management of up to 64 key switches, with optional GPIO and PWM-controlled LED drivers
• Manufacturer: Maxim

with I
Table 7. Keys FIFO Register Format (0x00)
The key number indicated by
D[5:0] is a key event. D7 is
always for a keypress 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 the FIFO
is a key release. When D6 is 0,
key data read from the FIFO is a
keypress.
FIFO is empty.
FIFO is overflow. Continue to
read data in the FIFO.
Key 63 is pressed. Read one
more time to determine whether
there is more data in the FIFO.
Key 63 is released. Read one
more time to determine whether
there is more data in the FIFO.
Key repeat. Indicates the last
data in the FIFO.
Key repeat. Indicates more data
in the FIFO.
Key 62 is pressed. Read one
more time to determine whether
there is more data in the FIFO.
Key 62 is released. Read one
more time to determine whether
there is more data in the FIFO.
8 x 8 Key-Switch Controller and LED Driver/GPIOs
SPECIAL FUNCTION
2
C Interface and High Level of ESD Protection
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empty flag
FIFO not-
D7
0
0
1
1
0
0
1
1
release
Key-
flag
D6
0
1
0
1
0
1
0
1
D5
1
1
1
1
1
1
1
1
KEYS FIFO REGISTER DATA
D4
1
1
1
1
1
1
1
1
Key number/key event
D3
1
1
1
1
1
1
1
1
D2
1
1
1
1
1
1
1
1
Register Tables
MAX7370
D1
1
1
1
1
1
1
1
1
D0
1
1
1
1
0
0
0
0