| 摘要 |
PURPOSE:To realize a repetition of a high speed to all possible patterns as a loop, by providing an extended field on a microinstruction. CONSTITUTION:For instance, when an extended field (E) of a microinstruction in a microinstruction register (MIR) 2 is a code ''LOOP'', a decoder (DEC) 10 generates a signal for controlling an object to be controlled by a regular method, also detects that the E field is LOOP, and sets a value of a microprogram counter (MPC) 3 in that case to an auxiliary register (AR) 4 through a line 12. The number of times of loop is set to a substraction counter (CNTR) 7 in advance by the microinstruction, a value of the AR4+1 are set to the MPC3 until said value becomes ''0'', a microinstruction corresponding to a value of the AR4 is read out from a microprogram memory (MPM) 1, and a value of the CNTR7 is decreased by ''1''. |
