
MC68HC908KX8 MC68HC908KX2 MC68HC08KX8 Data Sheet, Rev. 2.1
Freescale Semiconductor
111
Chapter 12
Serial Communications Interface Module (SCI)
12.1 Introduction
The serial communications interface (SCI) allows asynchronous communications with peripheral devices
and other microcontroller unit (MCU).
12.2 Features
The SCI module’s features include:
Full-duplex operation
Standard mark/space non-return-to-zero (NRZ) format
Choice of baud rate clock source:
–
Internal bus clock
–CGMXCLK
32 programmable baud rates
Programmable 8-bit or 9-bit character length
Separately enabled transmitter and receiver
Separate receiver and transmitter central processor unit (CPU) interrupt requests
Programmable transmitter output polarity
Two receiver wakeup methods:
–
Idle line wakeup
–
Address mark wakeup
Interrupt-driven operation with eight interrupt flags:
–
Transmitter empty
–
Transmission complete
–
Receiver full
–
Idle receiver input
–
Receiver overrun
–
Noise error
–
Framing error
–
Parity error
Receiver framing error detection
Hardware parity checking
1/16 bit-time noise detection