Apparatus for generating an interrupt by comparing newly receive

Details Apparatus for generating an interrupt by comparing newly receive Apparatus for generating an interrupt by comparing newly receive

1995-05-18

1998-11-24

Lee, Thomas C.

395733, G06F 1314

Patent

active

058420789

ABSTRACT:
An interface apparatus, built in a microcomputer, and capable of reducing the load on a CPIU by including a function to judge by itself, when data is received from the outside, whether it is necessary for the received data to generate an interruption request so as to make the (CPU execute the processing, thereby avoiding the generation of an unnecessary interruption request. The interface apparatus is provided with a receiving register 3 which stores data received newly, a buffer register 4 which stores data received precedingly, a table 5 which stores data designated beforehand, and a comparing circuit 6 which compares the data stored in them with each other to make an interruption control register 7 generate an interruption request signal INT only when the comparison results do not show coincidence.

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