Patent ID: 6237113
Filing Date: 2001-05-22
Classification: B60R

Abstract:
A method of using a trigger word to initialize a control unit including a microcontroller and coupled to a diagnostic bus for communicating signals over an RxD line of the microcontroller, the microcontroller including a port register and a receive buffer register, the method comprising the steps of:sampling information from the port register for one of a low logic state and a high logic state as a function of a predetermined sampling cycle to detect the trigger word;analyzing status information read out from the receive buffer register;performing a test at a sampling time during an input of the trigger word to determine one of:whether the receive buffer register is full, andwhether a transition from a high logic signal level to a low logic signal level is present on a K line of the diagnostic bus, wherein the trigger word causes a framing error communicated as a stop bit of the receive buffer register; andperforming one of the following:accepting an initialization of the control unit when the framing error is present, anddiscarding the initialization of the control unit and waiting for another transition from the high logic signal level to the low logic signal level.