6. SCC GENERAL INFORMATION
The Serial Communications Controller (SCC) is a dual channel, multi-protocol data
communications peripheral. The MPA-100 provides a single channel for communications,
however, to provide full DMA capabilities with complete modem control line support, 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 x 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
MPA-100 User's Manual 6-1