What are the functional types used in control words of 8251a?
The control words of 8251A are divided into two functional types.
1. Mode Instruction control word
2. Command Instruction control word
Mode Instruction control word:-This defines the general operational characteristics of 8251A.
Command Instruction control word:-The command instruction controls the real operations of the selected format such as enable transmit/receive, error reset and modem control.