Receive section
• Serial data is shifted into a shift register where start, stop and parity bits are stripped off. The remaining data is transferred to a buffer storage register and then on to the internal data bus
• Parallel data is put on an internal data bus, then stored in a buffer storage register from where it is sent to a shift register, which adds start and stop bits, and a parity bit. The data is then transmitted one bit at a time to a serial interface.