Electrical computers and digital processing systems: processing – Processing control – Branching
Reexamination Certificate
2011-06-21
2011-06-21
Chan, Eddie (Department: 2183)
Electrical computers and digital processing systems: processing
Processing control
Branching
C712S208000
Reexamination Certificate
active
07966480
ABSTRACT:
Trap flags and a pointer trap are associated with registers in a processor. Each trap flag indicates whether a corresponding register has been written with valid data. If not, the trap flag is set to indicate that the register corresponding to the trap flag contains invalid data. During instruction processing, the pointer trap receives control signals from instruction fetch/decode logic on the processor indicating an instruction being processed calls for a register to be used as a pointer. If the specified pointer register has its corresponding trap flag set, then the pointer trap indicates that a processing exception has occurred. The interrupt logic/exception processing logic then causes a trap interrupt service routine (ISR) to be executed in response to the exception. The ISR prevents errors from being introduced in the instruction processing due to invalid pointer values.
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Chan Eddie
King & Spalding L.L.P.
Microchip Technology Incorporated
Vicary Keith
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