Method and apparatus for monitoring microcomputer in electronic control unit

In an electronic control unit (50) for an anti-lock brake control system, a microcomputer (60) communicates data to a peripheral IC (70). The peripheral IC (70) monitors a fault of the microcomputer (60) based on data received from the microcomputer (60). The monitoring operation may be executed by measuring an interval of calculation, calculation result and sequence of data transmitted from the microcomputer (60).