參數(shù)資料
型號(hào)： TUSB3410VF
英文描述： BUS CONTROLLER
中文描述： 總線控制器
文件頁(yè)數(shù)： 68/92頁(yè)
文件大小： 317K
代理商： TUSB3410VF
10
–
4
The data from the device is latched into the I2CDAI register (stop condition is transmitted).
The RXF bit in the I2CSTA register is set and interrupts the MCU, indicating that data are available.
The MCU reads the I2CDAI register. This clears the RXF bit (I2CSTA[RXF] = 0)
End
10.5 Byte-Write Operation
The byte-write operation involves three phases: device address + EPROM [high byte]
phase
,
EPROM [low byte]
phase, and EPROM [DATA] phase. The following describes the sequence of events to accomplish the byte-write
transaction.
Device Address + EPROM [High Byte]
The MCU sets I2CSTA[SWR] = 0. This forces the I
2
C controller to not generate a stop condition after the
contents of the I2CDAO register are 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 E2PROM address into the I2CDAO register (this starts the transfer
on the SDA line).
The TXE bit in the I2CSTA register is cleared (indicates busy).
The contents of the I2CADR register are transmitted to the device (preceded by start condition on SDA).
The contents of the I2CDAO register are transmitted to the device (E2PROM high address).
The TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register
contents have been transmitted.
EPROM [Low Byte]
The MCU writes the low byte of the E2PROM address into the I2CDAO register.
The TXE bit in the I2CSTA register is cleared (indicating busy).
The contents of the I2CDAO register are transmitted to the device (E2PROM address).
The TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register
contents have been transmitted.
EPROM [DATA]
The MCU sets I2CSTA[SWR] = 1. This forces the I
2
C controller to generate a stop condition after the
contents of I2CDAO register are transmitted.
The The data to be written to E2PROM is written by the MCU into the I2CDAO register.
The TXE bit in the I2CSTA register is cleared (indicates busy).
The contents of the I2CDAO register are transmitted to the device (E2PROM data).
The TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register
contents have been transmitted.
The I
2
C controller generates a stop condition after the contents of the I2CDAO register are transmitted.
End
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