Control unit and device for programming it
First Claim
1. A control unit comprising:
- a microcomputer (13),a programmable nonvolatile memory (14) connected with or integrated in the microcomputer (13),a serial interface (15) for the microcomputer (13) to which at least one serial data transmission line (12) can be connected over which data for programming the programmable nonvolatile memory (14) is received in the microcomputer from an external programming unit (11), anda low pass filter connected to a terminal (16) for said at least one serial data transmission line, said low pass filter including means for producing a signal for enabling said programming of the programmable nonvolatile memory (14) if said external programming unit is connected to the control unit via said at least one serial data transmission line (12).
1 Assignment
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Accused Products
Abstract
The control unit, especially a motor vehicle control unit, includes a microcomputer (13), a programmable nonvolatile memory (14) connected with or integrated in the microcomputer (13), a serial interface (15) for the microcomputer (13) to which a serial data transmission line (12) can be connected over which data for programming the programmable nonvolatile memory (14) is received in the microcomputer from an external programming unit (11), and a low pass filter connected to a terminal (16) for the serial data transmission line. The low pass filter includes components that produce a signal for enabling the programming of the programmable nonvolatile memory (14) of the external programming unit is connected to the control unit via the serial data transmission line (12). These components preferably include a first resistor (R2) connected between the terminal (16) and a programming-enabling input (19) of the microcomputer (13), a capacitor (C1) connected between the programming-enabling input (19) and ground and a second resistor (R1) connected to ground between the capacitor (C1) and the programming-enabling input.
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Citations
16 Claims
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1. A control unit comprising:
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a microcomputer (13), a programmable nonvolatile memory (14) connected with or integrated in the microcomputer (13), a serial interface (15) for the microcomputer (13) to which at least one serial data transmission line (12) can be connected over which data for programming the programmable nonvolatile memory (14) is received in the microcomputer from an external programming unit (11), and a low pass filter connected to a terminal (16) for said at least one serial data transmission line, said low pass filter including means for producing a signal for enabling said programming of the programmable nonvolatile memory (14) if said external programming unit is connected to the control unit via said at least one serial data transmission line (12). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A device for programming a programmable nonvolatile memory in a control unit (10), wherein said control unit comprises:
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a microcomputer (13) connected with the programmable nonvolatile memory (14), a serial interface (15) for the microcomputer (13) to which at least one serial data transmission line (12) can be connected over which data for programming the programmable nonvolatile memory (14) is received in the microcomputer from an external programming unit (11), and a low pass filter connected to a terminal (16) for said at least one serial data transmission line, said low pass filter including means for producing a signal for enabling said programming of the programmable nonvolatile memory (14) if said external programming unit is connected to the control unit via said at least one serial data transmission line (12); and wherein said device comprises means for transmitting said signal enabling said programming to the control unit (10) via the at least one serial transmission line (12). - View Dependent Claims (15, 16)
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Specification