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STM32W108HB bảng dữ liệu(PDF) 112 Page - STMicroelectronics

tên linh kiện STM32W108HB
Giải thích chi tiết về linh kiện  High-performance, IEEE 802.15.4 wireless system-on-chip with up to 256 Kbytes of embedded Flash memory
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32W108HB bảng dữ liệu(HTML) 112 Page - STMicroelectronics

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Serial interfaces
STM32W108HB STM32W108CC STM32W108CB STM32W108CZ
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Doc ID 16252 Rev 14
Same as above except LSB first instead of MSB first.
9.4.2
Operation
When the slave select (nSSEL) signal is asserted by the master, SPI transmit data is driven
to the output pin MISO, and SPI data is received from the input pin MOSI. The nSSEL pin
has to be asserted to enable the transmit serializer to drive data to the output signal MISO.
A falling edge on nSSEL resets the SPI slave shift registers.
Characters transmitted and received by the SPI slave controller are buffered in the transmit
and receive FIFOs that are both 4 entries deep. When software writes a character to the
SCx_DR register, it is pushed onto the transmit FIFO. Similarly, when software reads from
the SCx_DR register, the character returned is pulled from the receive FIFO. If the transmit
and receive DMA channels are used, the DMA channels also write to and read from the
transmit and receive FIFOs.
Table 24.
SPI slave mode formats
SCx_SPICR
Frame format
MSTR
LSB
FIRST
CPHA CPOL
000
0
000
1
001
0
001
1
01
-
-
TX[7]
RX[7]
TX[6]
RX[6]
TX[5]
RX[5]
TX[4]
RX[4]
TX[3]
RX[3]
TX[2]
RX[2]
TX[1]
RX[1]
TX[0]
RX[0]
nSSEL
SCLKin
MOSIin
MISOout
TX[7]
RX[7]
TX[6]
RX[6]
TX[5]
RX[5]
TX[4]
RX[4]
TX[3]
RX[3]
TX[2]
RX[2]
TX[1]
RX[1]
TX[0]
RX[0]
SCLKin
MOSIin
MISOout
TX[7]
RX[7]
TX[6]
RX[6]
TX[5]
RX[5]
TX[4]
RX[4]
TX[3]
RX[3]
TX[2]
RX[2]
TX[1]
RX[1]
TX[0]
RX[0]
nSSEL
SCLKin
MOSIin
MISOout
TX[7]
RX[7]
TX[6]
RX[6]
TX[5]
RX[5]
TX[4]
RX[4]
TX[3]
RX[3]
TX[2]
RX[2]
TX[1]
RX[1]
TX[0]
RX[0]
nSSEL
MOSIin
MISOout
SCLKin



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