Datasheet

Chapter 8 Serial Communication Interface (SCIV4) Block Description
MC9S12E256 Data Sheet, Rev. 1.10
250 Freescale Semiconductor
TXD: transmit pin
8.2.2 Features
The SCI includes these distinctive features:
• Full-duplex or single-wire operation
• Standard mark/space non-return-to-zero (NRZ) format
• Selectable IrDA 1.4 return-to-zero-inverted (RZI) format with programmable pulse widths
• 13-bit baud rate selection
• Programmable 8-bit or 9-bit data format
• Separately enabled transmitter and receiver
• Programmable polarity for transmitter and receiver
• Programmable transmitter output parity
• Two receiver wakeup methods:
— Idle line wakeup
— Address mark wakeup
• Interrupt-driven operation with eight 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
8.2.3 Modes of Operation
The SCI functions the same in normal, special, and emulation modes. It has two low-power modes, wait
and stop modes.
8.2.3.1 Run Mode
Normal mode of operation.