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ST72321 Datasheet(PDF) 99 Page - STMicroelectronics |
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ST72321 Datasheet(HTML) 99 Page - STMicroelectronics |
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99 / 189 page  ST72321 99/189 10.6 SERIAL COMMUNICATIONS INTERFACE (SCI) 10.6.1 Introduction The Serial Communications Interface (SCI) offers a flexible means of full-duplex data exchange with external equipment requiring an industry standard NRZ asynchronous serial data format. The SCI of- fers a very wide range of baud rates using two baud rate generator systems. 10.6.2 Main Features ■ Full duplex, asynchronous communications ■ NRZ standard format (Mark/Space) ■ Dual baud rate generator systems ■ Independently programmable transmit and receive baud rates up to 500K baud. ■ Programmable data word length (8 or 9 bits) ■ Receive buffer full, Transmit buffer empty and End of Transmission flags ■ Two receiver wake-up modes: – Address bit (MSB) – Idle line ■ Muting function for multiprocessor configurations ■ Separate enable bits for Transmitter and Receiver ■ Four error detection flags: – Overrun error – Noise error – Frame error – Parity error ■ Five interrupt sources with flags: – Transmit data register empty – Transmission complete – Receive data register full – Idle line received – Overrun error detected ■ Parity control: – Transmits parity bit – Checks parity of received data byte ■ Reduced power consumption mode 10.6.3 General Description The interface is externally connected to another device by two pins (see Figure 62): – TDO: Transmit Data Output. When the transmit- ter and the receiver are disabled, the output pin returns to its I/O port configuration. When the transmitter and/or the receiver are enabled and nothing is to be transmitted, the TDO pin is at high level. – RDI: Receive Data Input is the serial data input. Oversampling techniques are used for data re- covery by discriminating between valid incoming data and noise. Through these pins, serial data is transmitted and received as frames comprising: – An Idle Line prior to transmission or reception – A start bit – A data word (8 or 9 bits) least significant bit first – A Stop bit indicating that the frame is complete. This interface uses two types of baud rate generator: – A conventional type for commonly-used baud rates, – An extended type with a prescaler offering a very wide range of baud rates even with non-standard oscillator frequencies. |
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