TUSB5052PZ datasheet(67/82 Pages) TI

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10−1

10 I2C Port

10.1 I2C Registers

10.1.1 I2CSTA: I2C Status and Control Register

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.

RxF

RIE

ERR

1/4

TxE

TIE

SRD

SWR

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 are transmitted to an external device.

SWR = 0 Stop condition is not generated when data from the I2CDAO register are shifted out to an external

device.

SWR = 1 Stop condition is generated when data from the I2CDAO register are shifted out to an external device.

SRD

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

and loaded into the I2CDAI register.

SRD = 0 Stop condition is not generated when data from SDA line is shifted into I2CDAI register.

SRD = 1 Stop condition is generated when data from SDA line are shifted into I2CDAI register.

TIE

I2C transmitter empty interrupt enable.

TIE = 0

Interrupt disable

TIE = 1

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 I2CDAO register.

TxE = 1

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

copied to the SDA shift register.

1/4

Bus speed selection.

1/4 = 0

100-kHz bus speed

1/4 = 1

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

Interrupt disable

RIE = 1

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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