ISD91200 Series Technical Reference Manual
Release Date: Sep 16, 2019
- 248 -
Revision 2.4
SPI Data Transmit Register (SPI0_TX)
Register
Offset
R/W Description
Reset Value
SPI0_TX
S 0x20
W
FIFO Data Transmit Register
0x0000_0000
31
30
29
28
27
26
25
24
TX
23
22
21
20
19
18
17
16
TX
15
14
13
12
11
10
9
8
TX
7
6
5
4
3
2
1
0
TX
Table 5-99 SPI Data Transmit Register (SPI0_TX, address S 0x20)
Bits
Description
[31:0]
TX
Data Transmit Register
A write to the data transmit register pushes data onto into the 8-level transmit FIFO buffer. The
number of valid bits depends on the setting of transmit bit width field of the SPI0_CTL register.
For example, if DWIDTH is set to 0x08, the bits TX[7:0] will be transmitted. If DWIDTH is set to 0,
the SPI controller will perform a 32-bit transfer.