SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 105
Version 1.9
10.4.2 SSI
For device configured as a master in this mode, SCK and CS are forced LOW, and the transmit data line DATA is in
3-state mode whenever the SSP hardware is idle.
Once the bottom entry of the transmit FIFO contains data, CS is pulsed HIGH for one SCK period. The value to be
transmitted is also transferred from the transmit FIFO to the serial shift register of the shifted out on the DATA pin.
Likewise, the MSB of the received data is shifted onto the DATA pin by the off-chip serial slave device.
Both the SSP hardware and the off-chip serial slave device then clock each data bit into their serial shifter on the falling
edge of each SCK. The received data is transferred from the serial shifter to the receive FIFO on the first rising edge of
SCK after the LSB has been latched.
10.4.3 COMMUNICATION FLOW
10.4.3.1 SINGLE-FRAME
SCK
CS
DATA
MSB
LSB
CS
CPOL=0
CPHA=1
CPOL=1
CPHA=0
CPOL=1
CPHA=1
CPOL=0
CPHA=0
DATA
MSB
MSB
LSB
DATA
LSB
MSB
LSB
1
2
3
4
5
6
7
8
SPI
TI
Содержание SN32F107
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