CR14 datasheet(25/46 Pages) STMICROELECTRONICS

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CR14

5 Applying the I²C protocol to the CR14 registers

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Figure 17. CR14-to-Host Transfer: I²C Random Address Read from Slot Marker Register

Figure 18. CR14-to-Host Transfer: I²C Current Address Read from Slot Marker Register

5.4

Addresses above Location 06h

In I²C Write mode, when the CR14 receives the 8-bit register address, and the address is above

location 06h, the device does not acknowledge (NoACK) and deselects itself from the bus. The

Serial Data line, SDA, stays at logic ‘1’ (pull-up resistor), and the I²C Host receives a NoACK

during the 9th bit time. The SDA line stays High until the STOP condition is issued.

In the I²C Current and Random Address Read modes, when the CR14 receives the 8-bit

Device Select Code after the START condition, and deselects itself from the bus.

1010 X X X

00h

FFh

ACK

Slot Marker

Address

Device Select

Code

Bus Master

CR14 Read

Bus Slave

ai12045

1010 X X X

R/W

Device Select

Code

R/W

NoACK

FFh

ACK

Bus Master

CR14 Read

Bus Slave

ai12047

1010 X X X

Device Select

Code

R/W

NoACK

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