Table 3. command byte definition – Rainbow Electronics MAX7473 User Manual
Page 12
MAX7472/MAX7473
HDTV Anti-Aliasing Filters with Triple-Input Mux
12
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COMMAND BYTE: INDIVIDUAL BIT DEFINITIONS
C7
C6
C5
C4
C3
C2
C1
C0
DESCRIPTION
0
0
0
0
0
0
0
0
Power-down.
0
0
0
0
0
0
0
1
Wake-up; resume normal operation using the frequency/status previously
stored (unless power has been cycled).
0
0
0
0
0
0
1
0
Set clamp voltage level for IN1 to low.
0
0
0
0
0
0
1
1
Set clamp voltage level for IN1 to high.
0
0
0
0
0
1
0
0
Set clamp voltage level for IN2 to low.
0
0
0
0
0
1
0
1
Set clamp voltage level for IN2 to high.
0
0
0
0
0
1
1
0
Set clamp voltage level for IN3 to low.
0
0
0
0
0
1
1
1
Set clamp voltage level for IN3 to high.
0
0
0
0
1
0
0
0
Select component input, color-burst filter disabled.
0
0
0
0
1
0
0
1
Select composite input, color-burst filter enabled.
0
0
0
0
1
0
1
0
Select internal sync.
0
0
0
0
1
0
1
1
Select external sync.
0
0
0
0
1
1
0
0
Select positive polarity for the external sync.
0
0
0
0
1
1
0
1
Select negative polarity for the external sync.
0
0
0
0
1
1
1
0
Enable filters.
0
0
0
0
1
1
1
1
Disable filters. Enter bypass mode.
0
0
0
1
0
0
0
0
Reset status to the default status as outlined in the Control/Status register
table. This command does not affect the Frequency register and the Channel
Selection register.
0
0
0
1
0
0
0
1
Request reading the Control/Status register. The interface expects an Sr
condition to follow with address and read/write set to read so that data can be
driven onto the bus.
0
0
0
1
0
0
1
0
Load the Frequency register with the data byte following the command word.
0
0
0
1
0
0
1
1
Request reading the Frequency register. The interface expects an Sr
condition to follow with address and read/write set to read so that data can be
driven onto the bus.
0
0
0
1
0
1
0
0
Select Input A.
0
0
0
1
0
1
0
1
Select Input B.
0
0
0
1
0
1
1
0
Select Input C.
0
0
0
1
0
1
1
1
Request reading the Channel Selection register. The interface expects an Sr
condition to follow with address and read/write set to read so that data can be
driven onto the bus.
Table 3. Command Byte Definition