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Mini57
Apr. 06, 2017
Page 348 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
USCI1 pins are configured in SYS_GPA_MFP, SYS_GPC_MFP, and SYS_GPD_MFP
registers.
Enable USCI1 peripheral clock in USCI1CKEN (CLK_APBCLK[25]).
Reset USCI1 controller in USCI1RST (SYS_IPRST1[25]).
6.13.5 Functional Description
6.13.5.1 USCI Common Function Description
Please refer to section 6.11.4 for detailed information.
6.13.5.2 Signal Description
A device operating in master mode controls the start and end of a data transfer, as well as the
generation of the SPI bus clock and slave select signal. The slave select signal indicates the start
and the end of a data transfer, and the master device can use it to enable the transmitting or
receiving operations of slave device. Slave device receives the SPI bus clock and optionally a
slave select signal for data transaction. The signals for SPI communication are shown as Table
6.13-1.
SPI Mode
Receive Data
Transmit Data
Serial Bus Clock
Slave Select
Full-duplex SPI
Master
SPI_MISO
(USCIx_DAT1)
SPI_MOSI
(USCIx_DAT0)
SPI_CLK
(USCIx_CLK)
SPI_SS
(USCIx_CTL0)
Full-duplex SPI
Slave
SPI_MOSI
(USCIx_DAT0)
SPI_MISO
(USCIx_DAT1)
SPI_CLK
(USCIx_CLK)
SPI_SS
(USCIx_CTL0)
Table 6.13-1 SPI Communication Signals (x=0, 1)
TX Data Word 0
TX Data Word N
Data Frame
SPI_SS
(USCIx_CTL0)
SPI_MOSI
(USCIx_DAT0)
SPI_CLK
(USCIx_CLK)
SPI_MISO
(USCIx_DAT1)
RX Data Word 0
RX Data Word N
Note:
x = 0, 1
Figure 6.13-4 4-Wire Full-Duplex SPI Communication Signals (Master Mode)
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