MULTIWAY EXCHANGE INSTRUCTION
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-05
Often the status or the operation mode of acomputercan be examined or set viadedicated control registers. These registers logically and physically,group and protect related status and control flags. In many cases, a new setting of operational modes may depend on the previous state, or the previous state may need to be restored after a temporary mode change. Hence it is quite common to read a control register, process, it, and restore it.