Datasheet

TCA6424
SCPS175A –NOVEMBER 2007–REVISED NOVEMBER 2009 www.ti.com
Table 5. Command Byte
CONTROL REGISTER BITS AUTO- COMMAND
POWER-UP
INCREMENT BYTE REGISTER PROTOCOL
DEFAULT
AI B6 B5 B4 B3 B2 B1 B0
STATE (HEX)
0 0 0 0 0 0 0 0 Disable 00
Input Port 0 Read byte xxxx xxxx
(1)
1 0 0 0 0 0 0 0 Enable 80
0 0 0 0 0 0 0 1 Disable 01
Input Port 1 Read byte xxxx xxxx
(1)
1 0 0 0 0 0 0 1 Enable 81
0 0 0 0 0 0 1 0 Disable 02
Input Port 2 Read byte xxxx xxxx
(1)
1 0 0 0 0 0 1 0 Enable 82
0 0 0 0 0 0 1 1 Disable 03
Reserved Reserved Reserved
1 0 0 0 0 0 1 1 Enable 83
0 0 0 0 0 1 0 0 Disable 04
Read/write
Output Port 0 1111 1111
byte
1 0 0 0 0 1 0 0 Enable 84
0 0 0 0 0 1 0 1 Disable 05
Read/write
Output Port 1 1111 1111
byte
1 0 0 0 0 1 0 1 Enable 85
0 0 0 0 0 1 1 0 Disable 06
Read/write
Output Port 2 1111 1111
byte
1 0 0 0 0 1 1 0 Enable 86
0 0 0 0 0 1 1 1 Disable 07
Reserved Reserved Reserved
1 0 0 0 0 1 1 1 Enable 87
0 0 0 0 1 0 0 0 Disable 08
Polarity Inversion Read/write
0000 0000
Port 0 byte
1 0 0 0 1 0 0 0 Enable 88
0 0 0 0 1 0 0 1 Disable 09
Polarity Inversion Read/write
0000 0000
Port 1 byte
1 0 0 0 1 0 0 1 Enable 89
0 0 0 0 1 0 1 0 Disable 0A
Polarity Inversion Read/write
0000 0000
Port 2 byte
1 0 0 0 1 0 1 0 Enable 8A
0 0 0 0 1 0 1 1 Disable 0B
Reserved Reserved Reserved
1 0 0 0 1 0 1 1 Enable 8B
0 0 0 0 1 1 0 0 Disable 0C
Read/write
Configuration Port 0 1111 1111
byte
1 0 0 0 1 1 0 0 Enable 8C
0 0 0 0 1 1 0 1 Disable 0D
Read/write
Configuration Port 1 1111 1111
byte
1 0 0 0 1 1 0 1 Enable 8D
0 0 0 0 1 1 1 0 Disable 0E
Read/write
Configuration Port 2 1111 1111
byte
1 0 0 0 1 1 1 0 Enable 8E
0 0 0 0 1 1 1 1 Disable 0F
Reserved Reserved Reserved
1 0 0 0 1 1 1 1 Enable 8F
(1) Undefined
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