CR14 datasheet(22/46 Pages) STMICROELECTRONICS

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5 Applying the I²C protocol to the CR14 registers

CR14

22/46

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

1010 X X X

00h

data

ACK

Value

Parameter Register

Address

Device Select

Code

Bus Master

CR14 Write

Bus Slave

ai12038

R/W

1010 X X X

00h

data

ACK

Value

Parameter Register

Address

Device Select

Code

Bus Master

CR14 Read

Bus Slave

ai12039

1010 X X X

R/W

Device Select

Code

R/W

NoACK

data

ACK

Value

Bus Master

CR14 Read

Bus Slave

ai12040

1010 X X X

Device Select

Code

R/W

NoACK

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