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Data processing device

A technology of a data processing device and a processing unit, which is applied in the directions of data processing power supply, data reset device, electrical digital data processing, etc., can solve the problems of inability to determine the fault content of the power-on reset circuit, and inability to distinguish between normal and abnormal.

Active Publication Date: 2020-01-03
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in the system described in Patent Document 1, when the power-on reset circuit fails, if the logic circuit seems to start normally at first glance, it cannot Differentiate between normal and abnormal
In addition, the existing system cannot determine the fault content of the power-on reset circuit

Method used

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Embodiment 1

[0023] The data processing device is a data processing device that can be applied to an electronic control system conforming to functional safety standards for automobiles. The data processing device has multiplexers 1a, 1b, power-on reset circuits (POR circuits) 2a, 2b, multiplexer 3, first expansion circuit 4, second expansion circuit 5, scratch pad register 6, digital / analog conversion circuit (DAC circuit) 7 , flip-flop circuit (FF) 8 , bus 10 , CPU 11 , memory 12 , timer 13 , and POR determination section 14 . In addition, the data processing device has a power supply terminal VDD, a monitor terminal DACTST, a first output level determination circuit 15 , a second output level determination circuit 16 , and an analog / digital conversion circuit (ADC circuit) 17 .

[0024] Scratch pad register 6, digital / analog conversion circuit 7, flip-flop circuit 8, memory 12, timer 13, POR determination section 14, first output level determination circuit 15, second output level deter...

Embodiment 2

[0054] The data processing device of the second embodiment is different from the data processing device of the first embodiment in that it has a logic gate 20 and a multiplexer 21 , and has a multi-bit selector 22 instead of the 1-bit-wide flip-flop circuit 8 .

[0055] The logic gate 20 is configured to take a logical OR (OR) of the outputs of the power-on reset circuits 2 a and 2 b and output it to the multiplexer 21 .

[0056] The multiplexer 21 is configured to select the output signal of the logic gate 20 when the selection signal s2 is 0, and to select the output of the multiplexer 3 when the selection signal s2 is 1.

[0057] The selector 22 is composed of a flip-flop circuit and a decoder circuit. The flip-flop circuit has, for example, a 2-bit structure having a physical structure in which at least upper bits are initialized to 0 when the power is turned on. For example, if Figure 5 As shown, the trigger circuit is configured to lose the balance of the output load....

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Abstract

The present invention provides a data processing device capable of determining whether a CPU is started by a normal power-on reset circuit to operate software, and determining whether the power-on reset circuit is normal. The data processing device may include a first power-on reset circuit (2a) that generates a first power-on reset signal depending on power source voltage, and a CPU (11) that activates based on a first power-on reset signal generated by the first power-on reset circuit (2a) and that runs software. The CPU (11) determines if the normal first power-on reset signal is used to cause the CPU (11) to activate and run the software.

Description

technical field [0001] The present invention relates to a data processing device applicable to an electronic control system conforming to functional safety standards for automobiles. Background technique [0002] In 1C (Integrated Circuit) and LSI (Large Scale Integration) such as microcomputers (hereinafter referred to as microcomputers) equipped with digital circuits, in order to initialize the output value of the flip-flop circuit in the internal circuit, a reset is required immediately after power is applied. Signal. [0003] Many ICs and LSIs have a built-in power-on reset (POR: Power-OnReset) circuit that detects the power supply voltage and generates a reset signal. [0004] The power-on reset circuit asserts the reset signal when the power supply voltage is lower than a constant voltage (assert) to make the inside of the IC and LSI into a reset state, and makes the reset signal invalid (de-assert) when the power supply voltage is higher than the constant voltage An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/24
CPCG06F1/24H03K17/22G06F1/26G06F9/4405G06F9/4403G06F15/177
Inventor 山崎尊永
Owner SANKEN ELECTRIC CO LTD
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