MCU read-write mode

Take the simulation SPIs as an example:

For other peripherals (UART, SPIM, I2s, i²c ... ) is a truth.

When the MCU is written: write primarily to a register, which is the entrance to the peripheral (which is basically done and the logic is turned).

Spis_tx_data = (i++);

Otherwise the MCU will not initiate write operations, the corresponding enable signal will not be some, the address is.

When the MCU reads: Mainly read a register, which is the exit of the peripheral (basically do the serial and logic).

Read_data = Spis_rx_data;

Otherwise the MCU will not initiate a read operation, the corresponding enable signal will not be some, the address is also.

MCU read-write mode