Patent ID: 7953965
Filing Date: 2011-05-31
Classification: G06F

Abstract:
1. A power tool system component, comprising: a microprocessor; a one wire communication terminal connecting said microprocessor to an external device; a flash memory storing an application program governing operation of an application mode during which said power tool system component is operated and a boot loader program governing operation of a boot loader mode during which at least part of the application program can be updated; wherein said microprocessor accesses said flash memory and implements the boot loader program and the application program by: (a) setting up and observing a temporal window during which one or more predetermined conditions must be met for the boot loader mode to be entered, wherein the predetermined conditions include successful completion of a calibration process that includes sending a calibration byte to the external device according to a format predetermined to allow the external device to adjust its baud rate for sending and receiving information; and (b) upon successful completion of the conditions within the temporal window, sending a confirmation to the device that the conditions have been satisfied and entering the boot loader mode.