參數(shù)資料
型號(hào)： 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(yè)數(shù)： 75/84頁(yè)
文件大?。?/td> 276K
代理商： TUSB5052B
10–3
The contents of the I2CDAO register are transmitted to E2PROM (EPROM address).
TXE bit in the I2CSTA register is set and interrupts the MCU, indicating that the I2CDAO register has been
transmitted.
Stop condition is notgenerated.
10.2.2 EPROM [Low-byte]
MCU writes the low-byte of the E2PROM address into the I2CDAO register.
TXE bit in the I2CSTA register is cleared (indicates 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 has been
transmitted.
This completes the dummy write operation. At this point, the E2ROM address is set and the MCU can do
either a single- or a sequential-read operation.
10.3 Current-Address Read Operation
Once the E
2
PROM address is set, the MCU can read a single byte by executing the following steps:
MCU sets I2CSTA[SRD] = 1. This forces the I
2
C controller to generate a stop condition after the
I2CDAI-register contents are received.
1.
2.
MCU writes the device address (R/W bit = 1) to the I2CADR register (read operation).
3.
MCU writes a dummy byte to the I2CDAO register (this starts the transfer on the SDA line).
4.
RXF bit in the I2CSTA register is cleared.
5.
Contents of the I2CADR register are transmitted to the device (preceded by start condition on SDA).
6.
Data from E2PROM are latched into the I2CDAI register (stop condition is transmitted).
7.
RXF bit in the I2CSTA register is set and interrupts the MCU, indicating that the data are available.
8.
MCU reads the I2CDAI register. This clears the RXF bit (I2CSTA[RXF] = 0).
9.
End
10.4 Sequential-Read Operation
Once the E
2
PROM address is set, the MCU can execute a sequential read operation by executing the following steps
(this example illustrates a 32-byte sequential read):
10.4.1 Device Address
1.
MCU sets I2CSTA[SRD] = 0. This forces the I
2
C controller notto generate a stop condition after the I2CDAI
register contents are received.
2.
MCU writes the device address (R/W bit = 1) to the I2CADR register (read operation).
3.
MCU writes a dummy byte to the I2CDAO register (this starts the transfer on the SDA line).
4.
RXF bit in the I2CSTA register is cleared.
5.
The contents of the I2CADR register are transmitted to the device (preceded by start condition on SDA).
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