Quatech RS-422/485, MPA-200/300 user manual SCC General Information

3 SCC GENERAL INFORMATION

The Serial Communications Controller (SCC) is a dual channel, multi-protocol data communications peripheral. The MPA-200 provides a single channel for communications, however, to provide full DMA capabilities, both channels of the SCC can be utilized. The SCC can be software configured to satisfy a wide variety of serial communications applications. Some of its protocol capabilities include:

1)Asynchronous Communications

￿5, 6, 7, or 8 bits per character

￿1, 1-1/2, or 2 stop bits

￿Odd, even, or no parity

￿Times 1, 16, 32, or 64 clock modes

￿Break generation and detection

￿Parity, overrun and framing error detection

2)Byte-oriented Synchronous Communications

￿Internal/external character synchronization

￿1 or 2 sync characters in separate registers

￿Automatic Cyclic Redundancy Check (CRC) generation/detection

3)SDLC/HDLC (Bit Synchronous) Communications

￿Abort sequence generation and checking

￿Automatic zero insertion and deletion

￿Automatic flag insertion between messages

￿Address field recognition

￿I-field residue handling

￿CRC generation and detection

￿SDLC loop mode with EOP recognition/loop entry and exit

4)NRZ, NRZI, or FM encoding/decoding

5 Quatech Inc., MPA-200/300 Manual