ISD94100 Series Technical Reference Manual
Sep 9, 2019
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6.14.9 Register Description
SPI Control Register
(SPI0_CTL)
Register
Offset
R/W Description
Reset Value
SPI0_CTL
0x00
R/W SPI0 Control Register
0x0000_0034
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
QUADIOEN
DUALIOEN
DATDIR
REORDER
SLAVE
UNITIEN
TWOBIT
15
14
13
12
11
10
9
8
RXONLY
HALFDPX
LSB
DWIDTH
7
6
5
4
3
2
1
0
SUSPITV
CLKPOL
TXNEG
RXNEG
SPIEN
Bits
Description
[31:23]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[22]
QUADIOEN
Quad I/O Mode Enable Bit (Only Supported in SPI0)
0 = Quad I/O mode Disabled.
1 = Quad I/O mode Enabled.
[21]
DUALIOEN
Dual I/O Mode Enable Bit (Only Supported in SPI0)
0 = Dual I/O mode Disabled.
1 = Dual I/O mode Enabled.
[20]
DATDIR
Data Port Direction Control
This bit is used to select the data input/output direction in half-duplex transfer and Dual/Quad
transfer
0 = SPI data is input direction.
1 = SPI data is output direction.
[19]
REORDER
Byte Reorder Function Enable Bit
0 = Byte Reorder function Disabled.
1 = Byte Reorder function Enabled. A byte suspend interval will be inserted among each
byte. The period of the byte suspend interval depends on the setting of SUSPITV.
Note:
Byte Reorder function is only available if DWIDTH is defined as 16, 24, and 32 bits.
[18]
SLAVE
Slave Mode Control
0 = Master mode.
1 = Slave mode.
[17]
UNITIEN
Unit Transfer Interrupt Enable Bit
0 = SPI unit transfer interrupt Disabled.
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