
Mini57
Apr. 06, 2017
Page 351 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
Figure 6.13-8 SPI Communication with Different SPI Clock Configuration (SCLKMODE=0x2)
Figure 6.13-9 SPI Communication with Different SPI Clock Configuration (SCLKMODE=0x3)
6.13.5.4 Slave Select Signal
The slave selection signal of SPI protocol is active high by default. In SPI Master mode, the USCI
controller can drive the control signal to off-chip SPI slave device through slave select pin SPI_SS
(USCIx_CTL0). In SPI Slave mode, the received slave select signal can be inverted by ININV
(USPI_CTLIN0[2]).
If the slave select signal of external SPI Master device is low active, the ININV (USPI_CTLIN0[2])
setting of slave device should be set to 1 for the inversion of input control signal. If USCI operates
as SPI Master mode, the output slave select inversion CTLOINV (USPI_LINECTL[7]) is also
Data N
Data (N+1)
Data Frame
SPI_SS
(USCIx_CTL0)
SPI_MOSI
(USCIx_DAT0)
SPI_CLK
(USCIx_CLK)
SPI_MISO
(USCIx_DAT1)
MSB
TX[n]
TX
[n-1]
LSB
TX[0]
LSB
RX[0]
RX
[n-1]
MSB
RX[n]
MSB
TX[n]
TX
[n-1]
LSB
TX[0]
LSB
RX[0]
RX
[n-1]
MSB
RX[n]
SLAVE (USPI_PROTCTL[0]) = 0;
SCLKMODE (USPI_PROTCTL[7:6]) = 0x2;
ININV (USPI_CTLIN0[2]) = 1;
LSB (USPI_LINECTL[0]) = 0;
CTLOINV (USPI_LINECTL[7]) = 1;
Data N
Data (N+1)
Data Frame
SPI_SS
(USCIx_CTL0)
SPI_MOSI
(USCIx_DAT0)
SPI_CLK
(USCIx_CLK)
SPI_MISO
(USCIx_DAT1)
MSB
TX[n]
TX
[n-1]
RX
[n-1]
MSB
RX[n]
MSB
TX[n]
TX
[n-1]
LSB
TX[0]
LSB
RX[0]
RX
[n-1]
MSB
RX[n]
LSB
TX[0]
LSB
RX[0]
SLAVE (USPI_PROTCTL[0]) = 0;
SCLKMODE (USPI_PROTCTL[7:6]) = 0x3;
ININV (USPI_CTLIN0[2]) = 1;
LSB (USPI_LINECTL[0]) = 0;
CTLOINV (USPI_LINECTL[7]) = 1;
Note:
x = 0, 1
Содержание Mini57 Series
Страница 376: ...Mini57 Apr 06 2017 Page 376 of 475 Rev 1 00 MINI57 SERIES TECHNICAL REFERENCE MANUAL 1 Receive buffer is full ...
Страница 472: ...Mini57 Apr 06 2017 Page 472 of 475 Rev 1 00 MINI57 SERIES TECHNICAL REFERENCE MANUAL 1 3 20 Pin TSSOP 4 4x6 5x0 9 mm ...
Страница 473: ...Mini57 Apr 06 2017 Page 473 of 475 Rev 1 00 MINI57 SERIES TECHNICAL REFERENCE MANUAL 9 1 33 pin QFN33 4x4x0 8 mm ...