Mikroe RS232 to I2C Click features the Littelfuse ZDU0110RFX bridge between a UART port and an I2C bus. It represents the connection between the MCU and the MAX3232 RS232 line driver and receiver. The ZDU0110RFX provides full-duplex asynchronous communications with a 128 byte FIFO buffer. 64 bytes each are allocated to receive and transmit operations. It also contains a 4kbit EEPROM and GPIO with programmable interrupt capability; programmable interrupts and interrupt lines for UART and GPIO notifications.