SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 106
Version 1.9
10.4.3.2 MULTI-FRAME
SCK
CS
DATA
F0
msb
F0
F0
F0
lsb
F1
msb
F1
F1
F1
lsb
CS
DATA
F0
msb
F0
F0
F0
lsb
F1
msb
F1
F1
F1
lsb
SCK
SCK
SCK
SCK
CPOL=0
CPHA=1
CPOL=1
CPHA=0
CPOL=1
CPHA=1
CPOL=0
CPHA=0
SPI
TI
10.5 Auto-SEL (Auto-CS)
The Auto-SEL function is enabled by default, and Auto-SEL data flow is controlled by hardware. If Auto-SEL function is
enabled, the SPI‘s hardware controls the SEL output of the SPI.
If Auto-SEL function is disabled by setting the SELDIS bit, the SELCTRL bit controls the SEL output of the SPI. If
Auto-SEL function is enabled, hardware controls the SEL output, and the actual value of SEL will be copied in the
SELCTRL Control bit of the SPI. As long as Auto-SEL is enabled, the value of the SELCTRL Control bit is read-only for
software.