Fast interrupt method

Details Fast interrupt method Fast interrupt method

1978-07-31

1981-02-10

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 946

Patent

active

042505461

ABSTRACT:
A method of performing a fast interrupt in a digital data processor having the capability of handling more than one interrupt is provided. When a fast interrupt request is received a flag is set and the program counter and condition code registers are stored on a stack. At the end of the interrupt servicing routine the return from interrupt instructions retrieves the condition code register which contains the status of the digital data processor and checks to see whether the flag has been set or not. If the flag is set it indicates that a fast interrupt was serviced and therefore only the program counter is unstacked.

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patent: 3781810 (1973-12-01), Downing
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patent: 3909794 (1975-09-01), Soltsien
patent: 4010448 (1977-03-01), Bennett et al.
patent: 4047161 (1977-09-01), Davis
"M6800 Microprocessor Application manual", Motorola Inc., 1975, pp. 3-2 to 3-7. _

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