I would like to ask what sp and ssp mean

Sp and ssp respectively refer to: SP means a more advanced Offer. SSP (SynchronousSerialPort) is a synchronous serial port controller that can control the operation of SPI, 4-wire SSI or Microwire bus. There can be multiple masters and slaves on a bus, but during a data transmission process, there can only be one master and one slave for data communication on the bus. In principle, data transmission is full-duplex, and 4~16-bit frame data is sent from the master to the slave or from the slave to the host. But in reality, in most cases only data flow in one direction contains meaningful data.

SSP (SynchronousSerialPort): Synchronous serial port. A communication module (or supported communication mode) included in some microprocessors is used to communicate with peripheral serial components or other microprocessors. These peripheral components can be serial E2PROM, shift register, display, A/ D converter etc. It contains two operating modes: Serial Peripheral Interface (SPI) and I2C bus.

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