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參數(shù)資料
| 型號： | TUSB5052B |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | USB to 2-Serial + 1-Parallel Controller With Configurable Optional Hub |
| 中文描述： | USB轉(zhuǎn)2 -串行接口1 -可配置可選并行控制器集線器 |
| 文件頁數(shù)： | 76/84頁 |
| 文件大?。?/td> | 276K |
| 代理商： | TUSB5052B |
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10–4
10.4.2 N-Byte Read (31 Bytes)
1.
Data from the device are latched into the I2CDAI register (stop condition is nottransmitted).
2.
RXF bit in the I2CSTA register is set and interrupts the MCU, indicating that data are available.
3.
MCU reads the I2CDAI register. This clears the RXF bit (I2CSTA[RXF] = 0).
4.
This operation repeats 31 times.
10.4.3 Last-Byte Read (Byte 32)
1.
MCU sets I2CSTA[SRD] = 1. This forces the I
2
C controller to generate a stop condition after the I2CDAI
register contents are received.
2.
Data from the device are latched into the I2CDAI register (stop condition is transmitted).
3.
RXF bit in the I2CSTA register is set and interrupts the MCU, indicating that data are available.
4.
MCU reads the I2CDAI register. This clears the RXF bit (I2CSTA[RXF] = 0).
5.
End
10.5 Byte-Write Operation
10.5.1 Device Address + EPROM [High-Byte]
MCU sets I2CSTA[SWR] = 0. This forces the I
2
C controller notto generate a stop condition after the
contents of the I2CDAO register are transmitted.
MCU writes the device address (R/W bit = 0) to the I2CADR register (write operation).
MCU writes the high-byte of the E2PROM address into the I2CDAO register (this starts the transfer on the
SDA line).
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).
TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register contents
have been transmitted.
10.5.2 EPROM [Low-Byte]
MCU writes the low-byte of the E2PROM address into the I2CDAO register.
TXE bit in the I2CSTA register is cleared (indicating busy).
The contents of the I2CDAO register are transmitted to the device (E2PROM address).
TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register contents
have been transmitted.
10.5.3 EPROM [DATA]
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 data to be written to E2PROM are written by the MCU into the I2CDAO register.
TXE bit in the I2CSTA register is cleared (indicates busy).
The contents of the I2CDAO register are transmitted to the device (E2PROM data).
TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register contents
have been transmitted.
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