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3 records (took 0.016 seconds)

    1.
    发明专利
    未知

    公开(公告)号：BR7903716A

    公开(公告)日：1980-02-05

    申请号：BR7903716

    申请日：1979-06-12

    Applicant: IBM

    Inventor： FAIRCHILD P ,  LEININGER J

    IPC: G06F9/22 ,  G06F9/30 ,  G06F9/305 ,  G06F9/318 ,  G06F9/34 ,  G06F9/355 ,  G06F12/06 ,  G06F9/26

    Abstract: A programmable control latch mechanism which is particularly useful in a microprocessor. One or more control latches are provided which can be set or reset under direct program control directly from the instruction register of a data processor by the loading therein of a unique program instruction. The unique instruction includes for each control latch two predetermined bit positions, one of which determines whether or not the control latch is to be changed and the other of which determines the binary value to which the control latch is to be changed. This enables anywhere from one to all of the control latches to be changed by a single instruction and enables each latch which is changed to be changed to any desired binary value. The control latch outputs can be used for storage page selection, direct control of external devices or circuits, selection of internal processor functions and the like.

    2.
    发明专利
    未知

    公开(公告)号：BR8003880A

    公开(公告)日：1981-01-13

    申请号：BR8003880

    申请日：1980-06-20

    Applicant: IBM

    Inventor： FAIRCHILD P ,  LEININGER J

    IPC: G06F9/22 ,  G06F9/38 ,  G06F9/40 ,  G06F9/48

    Abstract: A storage address link register system for enabling nested program branching wherein a first subroutine may call a second subroutine which is executed before the first subroutine returns program control back to the program which called it. The system includes a mechanism whereby the same set of storage address link registers may be used for nested branching both during the execution of a normal program and during the execution of an interrupt service program which breaks into the normal program and takes over control of the processor for a short interval of time. A mechanism is provided for saving the normal program values in the link registers at the commencement of the interrupt service program. A further mechanism is provided for monitoring the usage of the link registers by the interrupt program for enabling the normal program values to be restored in the link registers only after all interrupt program values have been removed from such link registers.

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