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SPI0 is accessed and controlled through four special function registers in the system controller: This bit does not indicate the instantaneous.
This bit ratasheet the instantaneous value that is present on the NSS port pin at the time that the register.
This bit will be set to logic 1 when the receive buffer has been read and contains no new information.
If there is new information available datashedt the receive buffer that has not been read, this bit will return to. In slave mode, data on MOSI is sampled in the center of each data bit. In master mode, data on MISO is sampled.
The four special function registers related to the operation of the SPI0 Bus are described in the following figures. SPI Busy read only. Operate in slave mode. Operate as a master.
CF – Silicon Labs – IC Chips – Kynix Semiconductor
This bit controls the SPI0 clock phase. Data centered on first edge of SCK period. Data centered on second edge of SCK period. This bit controls the SPI0 clock polarity.
SCK line low in idle state. SCK line high in idle state. Slave Selected Flag read only.
CF Datasheet(PDF) – Silicon Laboratories
It is cleared to logic 0 when NSS is high slave not selected. This bit does not indicate the instantaneous value at the NSS pin, but rather a de-glitched version of the pin input.
This bit mimics the instantaneous value that is present on the NSS port pin at the time that the register is read. This input is not de-glitched.
(PDF) C8051F320 Datasheet download
It returns to logic 0 when a data byte is transferred to the shift register from the transmit buffer or by a transition on SCK. Datasyeet there is new information available in the receive buffer that has not been read, this bit will return to logic 0.
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