MC68HC908MR8 Datasheet, PDF (249/372 Pages) Motorola, Inc – Microcontrollers

Serial Communications Interface (SCI)
Functional Description
• 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
13.4 Functional Description
The SCI allows full-duplex, asynchronous, NRZ serial communication
among 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.
Figure 13-1 shows the structure of the SCI module. Figure 13-2
provides a summary of the input/output (I/O) registers.
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
Serial Communications Interface (SCI)
Technical Data
249