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5 Applying the I²C protocol to the CR14 registers
CR14
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5
Applying the I²C protocol to the CR14 registers
5.1
I²C Parameter Register Protocol
Figure 10 shows how new data is written to the Parameter Register. The new value becomes
active after the I²C STOP condition.
Figure 11 shows how to read the Parameter Register contents. The CR14 sends and re-sends
the Parameter Register contents until it receives a NoACK from the I²C Host.
The CR14 supports the I²C Current Address and Random Address Read modes. The Current
Address Read mode can be used if the previous command was issued to the register where the
Read is to take place.
Figure 10. Host-to-CR14 Transfer: I²C Write to Parameter Register
Figure 11. CR14-to-Host Transfer: I²C Random Address Read from Parameter Register
Figure 12. CR14-to-Host Transfer: I²C Current Address Read from Parameter Register
S
T
A
R
T
1010 X X X
00h
data
S
T
O
P
ACK
ACK
ACK
Register Byte
Value
Parameter Register
Address
Device Select
Code
Bus Master
CR14 Write
Bus Slave
ai12038
R/W
S
T
A
R
T
1010 X X X
00h
data
S
T
O
P
ACK
ACK
ACK
Register Byte
Value
Parameter Register
Address
Device Select
Code
Bus Master
CR14 Read
Bus Slave
ai12039
R
E
S
T
A
R
T
1010 X X X
R/W
Device Select
Code
R/W
NoACK
data
S
T
O
P
ACK
Register Byte
Value
Bus Master
CR14 Read
Bus Slave
ai12040
S
T
A
R
T
1010 X X X
Device Select
Code
R/W
NoACK



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