Externally reprogrammable vehicular microcomputer with hardware

Details Externally reprogrammable vehicular microcomputer with hardware Externally reprogrammable vehicular microcomputer with hardware

1985-03-11

1988-06-14

Williams, Jr., Archie E.

Boots, shoes, and leggings

364425, 36443112, G06F 1520, G06F 1214

Patent

active

047516330

ABSTRACT:
To prevent change of data in a non-volatile programmable, ready-only memory (25) forming, together with a microprocessor (23) a control unit, for example for an automotive vehicle, while permitting programming of the memory from an external programming unit (P, 1), an interface (3, 11, 12) is provided through which a release-enable bus (13) also passes, data being transmitted in accordance with a predetermined characteristic--even or odd parity--, the parity correctness being checked. If the parity is correct, an "enter" signal is provided on the release-enable bus for storing the data; if not, retransmission is attempted for a predetermined number of time, and if it cannot be correctly effected, a malfunction indication output signal is generated.

REFERENCES:
patent: 3212063 (1965-10-01), Olson
patent: 3428944 (1969-02-01), Shimabakuro
patent: 4030080 (1977-06-01), Burkett et al.
patent: 4084240 (1978-04-01), Lappington
patent: 4352158 (1982-09-01), Date
patent: 4366541 (1982-12-01), Mouri et al.
patent: 4498151 (1985-02-01), Henry
patent: 4551803 (1985-11-01), Hosaka

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