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Electronic control apparatus having first microcomputer which forwards externally supplied updating data to a second microcomputer having a lower data receiving performance than the first microcomputer
Electronic control apparatus having first microcomputer which forwards externally supplied updating data to a second microcomputer having a lower data receiving performance than the first microcomputer
An electronic control apparatus such as an ECU of a motor vehicle contains first and second microcomputers, with the first microcomputer having a substantially higher data receiving performance than the second microcomputer. Data for updating a ROM of the second microcomputer, transmitted to the first microcomputer from an external apparatus at a relatively high data rate, are temporarily stored in RAM by the first microcomputer and then transmitted to the second microcomputer at a rate which is appropriate for the receiving performance of the second microcomputer.
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