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TUSB2136 数据表(PDF) 39 Page - Texas Instruments |
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TUSB2136 数据表(HTML) 39 Page - Texas Instruments |
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39 / 50 page  2–27 • The RXF bit in I2CSTA is set, and interrupts the MCU, indicating that data is available. • The MCU reads the I2CDAI register, clearing the RXF bit (I2CSTA[RXF] = 0). • This operation repeats 31 times. 3. Last-Byte Read (byte no. 32) • The MCU sets I2CSTA[SRD] = 1. This forces the I2C controller to generate a stop condition after the I2CDAI register is received. • Data from the device is latched into the I2CDAI register (stop condition is transmitted). • The RXF bit in I2CSTA is set, and interrupts the MCU, indicating that data is available. • The MCU reads the I2CDAI register, clearing the RXF bit (I2CSTA[RXF] = 0). 2.11.4 Write Operation (Serial EEPROM) The byte write operation involves three phases: 1) device address + EEPROM [high byte] phase, 2) EEPROM [low byte] phase, and 3) EEPROM [DATA]. The following describes the sequence of events to accomplish the byte write transaction: Device Address + EEPROM [High byte] • The MCU sets I2CSTA[SWR] = 0. This prevents the I2C controller from generating a stop condition after the content of the I2CDAO register is transmitted. • The MCU writes the device address (R/W bit = 0) to the I2CADR register (write operation). • The MCU writes the high byte of the EEPROM address into the I2CDAO register, starting the transfer on the SDA line. • The TXE bit in I2CSTA is cleared, indicating busy. • The content of the I2CADR register is transmitted to the device (preceded by a start condition on SDA). • The content of the I2CDAO register is transmitted to the device (EEPROM high-address). • The TXE bit in I2CSTA is set, and interrupts the MCU, indicating that the I2CDAO register has been transmitted. EEPROM [Low byte] • The MCU writes the low byte of the EEPROM address into the I2CDAO register. • The TXE bit in I2CSTA is cleared, indicating busy. • The content of the I2CDAO register is transmitted to the device (EEPROM address). • The TXE bit in I2CSTA is set, and interrupts the MCU, indicating that the I2CDAO register has been transmitted. |
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