Microprogram control circuit

Details Microprogram control circuit Microprogram control circuit

1981-05-11

1983-10-04

Atkinson, Charles E.

Excavating

364200, 371 12, G06F 1100

Patent

active

044083289

ABSTRACT:
A microprogram control circuit interrupts high speed clock signals inputted to a processor when a HALT instruction issues from the processor in order to end operation at completion of a program. The clock signal is provided only when a program is in process. Should a program continue beyond a preselected time period without a HALT instruction, a control circuit including a timer detects this condition and interrupts the clock signals to the processor. Either an external signal or an automatic internally generated signal allows the clock signal to again enter the processor, reset the registers and address counter, and restart the program. In an alternative embodiment, abnormal operation causes the program to restart without interrupting the clock signals.

REFERENCES:
patent: 3749897 (1973-07-01), Hirvela
patent: 3795800 (1974-03-01), Nimmo
patent: 4231089 (1980-10-01), Lewine et al.
patent: 4321666 (1982-03-01), Tasar et al.
patent: 4351050 (1982-09-01), Higashiyama
Carnes et al., Processor Checking, IBM Technical Disclosure Bulletin, vol. 17, No. 11, Apr. 1975, pp. 3188-3189.

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