Microcomputer for automotive system
First Claim
Patent Images
1. A microcomputer for a promptness of an automotive system comprising:
- a CPU; and
a peripheral circuit including an initialization means for initializing the peripheral circuit without movement directive from the CPU after the microcomputer performs a reset operation, wherein the reset operation includes a reset operation for the CPU and a reset operation for the peripheral circuit that end substantially concurrently with the initialization being started.
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Abstract
A power-on reset operation is succeeded by initialization operations of a central processing unit (CPU) and a peripheral circuit in an electric control unit (ECU). The initialization operation controlled by the peripheral circuit proceeds in parallel with the initialization operation of the CPU. A communication session between the ECUs is established in the initialization operations by a communication controller. Parallel execution of the initialization operations contributes to a decrease of initialization time of the ECU and results in a prompt start-up of an automotive system using the ECU.
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Citations
10 Claims
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1. A microcomputer for a promptness of an automotive system comprising:
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a CPU; and
a peripheral circuit including an initialization means for initializing the peripheral circuit without movement directive from the CPU after the microcomputer performs a reset operation, wherein the reset operation includes a reset operation for the CPU and a reset operation for the peripheral circuit that end substantially concurrently with the initialization being started. - View Dependent Claims (2, 3, 4, 5, 8)
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6. A microcomputer having a CPU and a peripheral circuit that prepares initialization data in a power-off operation for a subsequent initialization comprising:
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a data storage means implemented as a non-volatile memory for storing the initialization data of the peripheral circuit;
an initialization means for initializing the peripheral circuit after performing a reset operation by using the initialization data in the data storage means automatically without movement directive from the CPU; and
a power-off control means for storing the initialization data for the subsequent initialization in the data storage means in the power-off operation. - View Dependent Claims (7)
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9. A method performed by a microcomputer for an initialization of a CPU and a peripheral circuit comprising the steps of:
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resetting the CPU and the peripheral circuit when the microcomputer is turned on;
initializing the CPU and the peripheral circuit substantially simultaneously with each other subsequent to the resetting; and
preparing initialization data for use in a subsequent initializing process of the peripheral circuit while the microcomputer is turning off. - View Dependent Claims (10)
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Specification