Microcomputer with built-in reset function

A microcomputer and reset signal technology, applied in data reset devices, electrical components, electronic switches, etc., can solve problems such as complex manufacturing processes, and achieve the effects of eliminating adjustment, reducing power consumption, and reducing power consumption.

Inactive Publication Date: 2003-02-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at this time, since it is necessary to adjust the reset voltage of each microcomputer individually, the product cannot be operated by simply installing the microcomputer, and there is a problem that the manufacturing process is complicated.

Method used

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  • Microcomputer with built-in reset function
  • Microcomputer with built-in reset function
  • Microcomputer with built-in reset function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 It is a block diagram showing the configuration of a reset portion related to reset judgment in a microcomputer (microcomputer) with a built-in reset function according to Embodiment 1 of the present invention. exist figure 1 Among them, 10 is a reset determination unit that generates a reset signal SR for instructing whether to perform a reset operation, and 20 is a reset control unit that controls whether to operate the reset determination unit 10 through an enable signal SE. The operation of the reset determination control unit 20 will be described later.

[0028] The reset judging section 10 includes: a band-to-band reference circuit (BGR) 11 as a stable power supply circuit that generates a stable predetermined reference voltage VA; and a voltage dividing resistor as a reset voltage generating circuit that divides the reference voltage VA to generate a reset voltage VR. 12; and a comparator 13 that compares the power supply voltage VDD applied to the m...

Embodiment 2

[0047] Figure 5 It is a block diagram showing the configuration of the reset portion related to the reset judgment in the microcomputer with built-in reset function according to the second embodiment of the present invention. exist Figure 5 in, with figure 1 The same components are assigned the same symbols, and detailed description thereof will be omitted here. exist Figure 5 Among them, the reset determination unit 10A has an output control device 14 that receives the comparison result SC of the comparator 13 and activates the interrupt function of the microcomputer. When the output control means 14 detects that the comparison result SE is valid in the interrupt routine, it makes the reset signal SR valid.

[0048] That is, when the power supply voltage VDD applied to the microcomputer is lower than the reset potential VR, the comparison result SC of the comparator 13 becomes valid, thereby enabling the interrupt function of the microcomputer through the output contr...

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PUM

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Abstract

The reset function incorporated microcomputer of the present invention, capable of suppressing a variation in reset voltage with a simple configuration. In the reset decision section 10, a band gap reference circuit 11 generates a predetermined reference voltage VA. A voltage dividing resistance 12 generates a reset voltage VR from the reference voltage VA. A comparator 13 compares the supply voltage VDD applied to the microcomputer with the reset voltage VR, and outputs a reset signal SR.

Description

technical field [0001] The invention relates to a microcomputer with built-in reset function. Background technique [0002] In the past, in most systems, a single-chip microcomputer (hereinafter referred to as a microcomputer) was provided with a reset IC for preventing a runaway caused by a power supply voltage drop outside the microcomputer. However, there is a tendency to incorporate a reset IC in a microcomputer due to demands such as cost reduction and semiconductor singulation. [0003] Image 6 A diagram showing a configuration example of a conventional microcomputer with a built-in reset function. exist Image 6 Among them, in order to prevent the microcomputer from being out of control caused by the drop of the power supply voltage, the reset signal generating circuit 61 built in the microcomputer and reset block 60 constantly detects the change of the power supply voltage applied to the microcomputer, and resets when the power supply voltage drops to potential, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/22G06F1/24G06F1/30
CPCG06F1/24G06F1/30
Inventor 石川忠义中塚淳二上野博也德野吉宣
Owner PANASONIC CORP
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