SN32F760 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 137
Version 2.0
12.4.2 SSI
For device configured as a master in this mode, SCK and CS are forced LOW, and the transmit data line DX 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 DX pin.
Likewise, the MSB of the received data is shifted onto the DR 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.
12.4.3 COMMUNICATION FLOW
12.4.3.1 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 SN32F755
Страница 218: ...SN32F760 Series 32 Bit Cortex M0 Micro Controller SONiX TECHNOLOGY CO LTD Page 218 Version 2 0 22 2 LQFP 64 PIN...
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