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Mini57
Apr. 06, 2017
Page 379 of 475
Rev.1.00
MINI5
7
S
E
RI
E
S
TECH
NIC
A
L R
E
F
E
RE
N
CE
MA
N
UA
L
USCI Protocol Control Register
– SPI (USPI_PROTCTL)
Register
Offset
R/W Description
Reset Value
USPI_PROTCTL
x = 0, 1
U0x5C R/W USCI Protocol Control Register
0x0000_0300
31
30
29
28
27
26
25
24
PROTEN
Reserved
TXUDRPOL
Reserved
SLVTOCNT
23
22
21
20
19
18
17
16
SLVTOCNT
15
14
13
12
11
10
9
8
Reserved
TSMSEL
SUSPITV
7
6
5
4
3
2
1
0
SCLKMODE
Reserved
AUTOSS
SS
SLV3WIRE
SLAVE
Bits
Description
[31]
PROTEN
SPI Protocol Enable Bit
0 = SPI Protocol Disabled.
1 = SPI Protocol Enabled.
[30:29]
Reserved
Reserved.
[28]
TXUDRPOL
Transmit Under-run Data Polarity (for Slave)
This bit defines the transmitting data level when no data is available for transferring.
0 = The output data level is 0 if TX under-run event occurs.
1 = The output data level is 1 if TX under-run event occurs.
[27:26]
Reserved
Reserved.
[25:16]
SLVTOCNT
Slave Mode Time-out Period (Slave Only)
In Slave mode, this bit field is used for Slave time-out period. This bit field indicates how
many clock periods (selected by TMCNTSRC, USPI_BRGEN[5]) between the two edges
of input SCLK will assert the Slave time-out event. Writing 0x0 into this bit field will disable
the Slave time-out function.
Example: Assume SLVTOCNT is 0x0A and TMCNTSRC (USPI_BRGEN[5]) is 1, it means
the time-out event will occur if the state of SPI bus clock pin is not changed more than
(10+1) periods of f
DIV_CLK
.
[15]
Reserved
Reserved.
[14:12]
TSMSEL
Transmit Data Mode Selection
This bit field describes how receive and transmit data is shifted in and out.
0x0 = Full-duplex SPI.
Other values are reserved.
Note:
Changing the value of this bit field will produce the TXRST and RXRST to clear the
TX/RX data buffer automatically.
[11:8]
SUSPITV
Suspend Interval (Master Only)
This bit field provides the configurable suspend interval between two successive
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