DATA PROCESSING SYSTEM REGISTER CONTROL

摘要

A DATA PROCESSING SYSTEM HAVING A PLURALITY OF REGISTERS 10 AND AN ARITHMETIC LOGIC UNIT 20, 22, 24 IS RESPONSIVE TO PROGRAM INSTRUCTION WORDS. AT LEAST ONE PROGRAM INSTRUCTION WORD INCLUDES A DESTINATION REGISTER BIT FIELD <DEST> SPECIFYING A DESTINATION REGISTER OF A RESULT DATA WORD AND A DESTINATION REGISTER WRITE DISABLE FLAG FOR DISABLING WRITING OF THAT RESULT DATA WORD TO THE DESTINATION REGISTER.(FIG. 2)