TUSB3410 datasheet(65/92 Pages) TI

65 / 92 page

10–1

10 I2C-Port

10.1 I2C Registers

10.1.1 I2CSTA: I2C Status and Control Register (Addr:FFF0)

This register is used to control the stop condition for read and write operations. In addition, it provides transmitter and

receiver handshake signals with their respective interrupt enable bits.

765

RXF

RIE

ERR

1/4

TXE

TIE

SRD

SWR

R/O

R/W

R/C

R/W

R/O

R/W

BIT

NAME

RESET

FUNCTION

SWR

Stop write condition. This bit determines if the I2C controller generates a stop condition when data

from the I2CDAO register is transmitted to an external device.

SWR = 0

Stop condition is not generated when data from the I2CDAO register is shifted out to an

external device.

SWR = 1

Stop condition is generated when data from the I2CDAO register is shifted out to an

external device.

SRD

Stop read condition. This bit determines if the I2C controller generates a stop condition when data is

received and loaded into the I2CDAI register.

SRD = 0

Stop condition is not generated when data from the SDA line is shifted into the I2CDAI

SRD = 1

Stop condition is generated when data from the SDA line are shifted into the I2CDAI

TIE

I2C transmitter empty interrupt enable

TIE = 0

TIE = 1

Interrupt disable

Interrupt enable

TXE

I2C transmitter empty. This bit indicates that data can be written to the transmitter. It can be used for

polling or it can generate an interrupt.

TXE = 0

Transmitter is full. This bit is cleared when the MCU writes a byte to the II2CDAO

TXE = 1

Transmitter is empty. The I2C controller sets this bit when the contents of the I2CDAO

1/4

Bus speed selection

1/4 = 0

1/4 = 1

100-kHz bus speed

400-kHz bus speed

ERR

Bus error condition. This bit is set by the hardware when the device does not respond. It is cleared by

the MCU.

ERR = 0

No bus error

ERR = 1

Bus error condition has been detected. Clears when the MCU writes a 1. Writing a 0 has

no effect.

RIE

I2C receiver ready interrupt enable

RIE = 0

RIE = 1

Interrupt disable

Interrupt enable

RXF

I2C receiver full. This bit indicates that the receiver contains new data. It can be used for polling or it

can generate an interrupt.

RXF = 0

Receiver is empty. This bit is cleared when the MCU reads the I2CDAI register.

RXF = 1

Receiver contains new data. This bit is set by the I2C controller when the received serial

data has been loaded into the I2CDAI register.

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