TCA6424A
SCPS193B –JULY 2010–REVISED SEPTEMBER 2010
POWER-UP
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Table 5. Command Byte
CONTROL REGISTER BITS
AUTO-
INCREMENT
STATE
COMMAND
BYTE
REGISTER
PROTOCOL
DEFAULT
AI B6 B5
B4
B3
B2
B1
B0
(HEX)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
Disable
Enable
00
80
01
81
02
82
03
83
04
84
05
85
06
86
07
87
08
88
09
89
0A
8A
0B
8B
0C
8C
0D
8D
0E
8E
0F
8F
Input Port 0
Input Port 1
Input Port 2
Reserved
Read byte
Read byte
Read byte
Reserved
xxxx xxxx(1)
xxxx xxxx(1)
xxxx xxxx(1)
Reserved
1111 1111
1111 1111
1111 1111
Reserved
0000 0000
0000 0000
0000 0000
Reserved
1111 1111
1111 1111
1111 1111
Reserved
Read/write
byte
Output Port 0
Output Port 1
Output Port 2
Reserved
Read/write
byte
Read/write
byte
Reserved
Polarity Inversion
Port 0
Read/write
byte
Polarity Inversion
Port 1
Read/write
byte
Polarity Inversion
Port 2
Read/write
byte
Reserved
Reserved
Read/write
byte
Configuration Port 0
Configuration Port 1
Configuration Port 2
Reserved
Read/write
byte
Read/write
byte
Reserved
(1) Undefined
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