Electronic control apparatus with a first microcomputer, the updating data supplied from the outside to a second microcomputer, the lower reception power than the first microcomputer comprises

摘要

An electronic control device such as, for example, an ecu of a motor vehicle contains a first and a second microcomputer, wherein the first microcomputer, a significantly higher data reception power than the second microcomputer has. Data for updating of a rom of the second microcomputer, transmitted by an external device to the first microcomputer with a relatively high data rate, are temporarily in the ram of the first microcomputer is stored and then to the second microcomputer transmitted at a rate which, for the reception power of the second microcomputer is suitable.