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)： 74/84頁(yè)
文件大小： 276K
代理商： TUSB5052B
10–2
10.1.2
I2CADR: I
2
C Address Register
This register holds the device address and the read/write command bit.
A6
R/W
A5
R/W
A4
R/W
A3
R/W
A2
R/W
A1
R/W
A0
R/W
R/W
7
6
5
4
3
2
1
0
R/W
BIT
NAME
RESET
FUNCTION
0
R/W
0
Read/write command bit.
R/W = 0 Write operation
R/W = 1 Read operation
7–1
A[6:0]
0h
Seven address bits for device addressing.
10.1.3
I2CDAI: I
2
C Data-Input Register
This register holds the received data from an external device.
D7
R/O
D6
R/O
D5
R/O
D4
R/O
D3
R/O
D2
R/O
D1
R/O
D0
R/O
7
6
5
4
3
2
1
0
BIT
NAME
RESET
FUNCTION
7–0
D[7:0]
0
8-bit input data form an I2C device
10.1.4
I2CDAO: I
2
C Data-Output Register
This register holds the data to be transmitted to an external device. Writing to this register starts the transfer on the
SDA line.
D7
W/O
D6
W/O
D5
W/O
D4
W/O
D3
W/O
D2
W/O
D1
W/O
D0
W/O
7
6
5
4
3
2
1
0
BIT
NAME
RESET
FUNCTION
7–0
D[7:0]
0
8-bit input data to an I2C device
10.2 Random-Read Operation
A random read requires a dummy byte-write sequence to load in the data word address. Once the device-address
word and the data-word address are clocked out and acknowledged by the device, the MCU starts a current-address
sequence. The following describes the sequence of events to accomplish this transaction:
10.2.1 Device Address + EPROM [High-Byte]
MCU sets I2CSTA[SRD] = 0.
This forces the I
2
C controller not o generate a stop condition after the contents
of the I2CDAI
register are received.
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 content of the I2CADR register is transmitted to E2PROM (preceded by start condition on SDA).
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