參數(shù)資料
型號(hào)： TUSB3410VF
英文描述： BUS CONTROLLER
中文描述： 總線控制器
文件頁數(shù)： 66/92頁
文件大?。?/td> 317K
代理商： TUSB3410VF
10
–
2
10.1.2 I2CADR: I
2
C Address Register (Addr:FFF3)
This register holds the device address and the read/write command bit.
7
6
5
4
3
2
1
0
A6
A5
A4
A3
A2
A1
A0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BIT
0
NAME
R/W
RESET
0
FUNCTION
Read/write command bit
R/W = 0
R/W = 1
Write operation
Read operation
7
–
1
A[6:0]
0h
Seven address bits for device addressing
10.1.3 I2CDAI: I
2
C Data-Input Register (Addr:FFF2)
This register holds the received data from an external device.
7
6
5
4
3
2
1
0
D7
R/O
D6
R/O
D5
R/O
D4
R/O
D3
R/O
D2
R/O
D1
R/O
D0
R/O
BIT
7
–
0
NAME
D[7:0]
RESET
0
FUNCTION
8-bit input data from an I2C device
10.1.4 I2CDAO: I
2
C Data-Output Register (Addr:FFF1)
This register holds the data to be transmitted to an external device. Writing to this register starts the transfer on the
SDA line.
7
6
5
4
3
2
1
0
D7
W/O
D6
W/O
D5
W/O
D4
W/O
D3
W/O
D2
W/O
D1
W/O
D0
W/O
BIT
7
–
0
NAME
D[7:0]
RESET
0
FUNCTION
8-bit output 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.
Device Address + EPROM [High Byte]
The MCU sets I2CSTA[SRD] = 0.
This forces the I
2
C controller not to generate a stop condition after the
contents of the I2CDAI
register are received.
The MCU sets I2CSTA[SWR] = 0. This forces the I
2
C controller not to 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 content of the I2CADR register is transmitted to E2PROM (preceded by start condition on SDA).
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