Patent ID: 7424383
Filing Date: 2008-09-09
Classification: G06F,H04L

Abstract:
1. An abnormality detection device for detecting an abnormality in a communication bus, the device comprising: a timer counter configured to measure a time during which a logical output of said communication bus remains at a first logical level which is a high level or a low level; a comparator configured to compare the time measured by said timer counter with a threshold value and to output an abnormality detection signal indicating an abnormality in said communication bus when the time surpasses said threshold value, wherein the abnormality detection device is independent of a CPU controlling the communication bus and detects the abnormality directly from the communication bus; a plurality of comparison value registers respectively configured to store a plurality of threshold values; and a selector configured to store a threshold value from among said plurality of said threshold values according to a selection signal supplied thereto so as to supply said threshold value to said comparator.