MC68HC08AS20 Datasheet, PDF (234/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

17.4 Functional Description
Figure 17-1 shows the structure of the SCI module. The SCI allows
full-duplex, asynchronous, NRZ serial communication between the MCU
and remote devices, including other MCUs. The transmitter and receiver
of the SCI operate independently, although they use the same baud rate
generator. During normal operation, the CPU monitors the status of the
SCI, writes the data to be transmitted, and processes received data.
Advance Information
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MC68HC08AS20 —Rev. 4.1
Freescale Semiconductor