JAJSGI5D November 2018 – June 2022 TLIN1441-Q1
PRODUCTION DATA
This input pin is used to shift data into the device. Once the SPI is enabled by a low on nCS, the SDI samples the input shifted data on each rising edge of the SPI clock (SCK). The data is shifted into an 8 bit shift register. After eight (8) clock cycles and shifts, the addressed register is read giving the data to be shifted out on SDO. After eight clock cycles, the shift register is full and the SPI transaction is complete. If the command code was a writes the new data is written into the addressed register only after exactly 8 bits have been shifted in by CLK and the nCS has a rising edge to deselect the device. If there are not exactly 8 bits shifted in to the device the during one SPI transaction (nCS low), the SPI command is ignored, the SPIERR flag is set and the data is not written into the device preventing any false actions by the device.