Interrupt controller and method of accessing interrupts
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United States of America Patent
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May 25, 2004
Grant Date -
N/A
app pub date -
Sep 29, 2000
filing date -
Oct 1, 1999
priority date (Note) -
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Abstract
An interrupt controller and an interrupt handling method thereof are described. When there is an interrupt, a priority level of an interrupt source is determined and a corresponding branch instruction is generated and inputted to a CPU. The CPU then directly branches off to a position containing an interrupt service routine addressed by the inputted branch instruction instead of a general CPU instruction, similar to interrupt handling in CISCs with vectored interrupts. Therefore, interrupt handling time is reduced.
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