W90N745CD Datasheet, PDF (353/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
I²C Data Transmit Register 0/1 (I²C_TxR 0/1)
REGISTER
I²C_TXR0
I²C_TXR1
ADDRESS R/W
DESCRIPTION
0xFFF8_6014 R/W I²C Data Transmit Register
0xFFF8_6114 R/W I²C Data Transmit Register
31
30
29
28
27
26
Tx [31:24]
23
22
21
20
19
18
Tx [23:16]
15
14
13
12
11
10
Tx [15:8]
7
6
5
4
3
2
Tx [7:0]
RESET VALUE
0x0000_0000
0x0000_0000
25
24
17
16
9
8
1
0
BITS
[31:0]
DESCRIPTIONS
Data Transmit Register
The I²C core used 32-bit transmit buffer and provide multi-byte
transmit function. Set CSR[Tx_NUM] to a value that you want to
transmit. I²C core will always issue a transfer from the highest byte
first. For example, if CSR[Tx_NUM] = 0x3, Tx[31:24] will be
transmitted first, then Tx[23:16], and so on.
Tx
In case of a data transfer, all bits will be treated as data.
In case of a slave address transfer, the first 7 bits will be treated as 7-
bit address and the LSB represent the R/W bit. In this case,
LSB = 1, reading from slave
LSB = 0, writing to slave
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