JPH0525517U - Initial setting circuit - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce power consumption. [Structure] When the information set in the switch 1 is read, the decode logic circuit 9 makes the transistor 8 conductive, and a current flows from the power supply to the pull-up resistor 6 via the transistor 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an initial setting circuit.

[0002]

[Prior Art]

 FIG. 2 shows a conventional example of the initialization circuit.

One contact of the switch 1 is connected to the ground and the other contact is connected to the battery via the pull-up resistor 6, and information is set in the switch 1 in advance. That is, the switch 1 is turned on or off according to the information, and the input terminal of the gate 7 is at high level or low level. When the power is turned on in this state, the microprocessor 2 outputs information to the address bus 3 and the control bus 4, and the decode logic circuit 10 uses the information output to the address bus 3 and the control bus 4 based on the information. The gate 7 was turned on, and the information set in the switch 1 was read by the microprocessor 2 via the data bus 5.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional example, since the current is always passed through the pull-up resistor 6 of the initial setting switch 1, there is a problem that useless power is consumed.

An object of the present invention is to solve the above problems and provide an initial setting circuit capable of reducing wasteful power consumption.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention has a switch group for initial setting in which one contact is connected to the ground and the other contact is connected to a power source through a pull-up resistor and a switching means. When the information set in the switch group is read, a control means for electrically connecting the switching means is provided.

[0007]

[Action]

 According to the present invention, when the information set in the switch group is read, the switching means is made conductive by the control means, and a current is caused to flow from the power supply to the pull-up resistor via the switching means.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, 1 to 7 show the same parts as in FIG. Reference numeral 9 is a decode logic circuit, which controls ON / OFF of the gate 7 and the PNP transistor 8 at the same time based on the information output to the address bus 3 and the control bus 4 by the microprocessor 2. The transistor 8 supplies or cuts off the electric power from the power supply to the resistor 6 based on the signal from the decode logic circuit 9 input to the base.

Next, the operation will be described.

The contacts of the switch 1 are closed or released according to the information, and the information is set.

When the power is turned on in this state, the microprocessor 2 outputs information to the address bus 3 and the control bus 4, and based on the information output to the address bus 3 and the control bus 4, the decode logic circuit 10 This turns on the gate 7 and the transistor 8. Therefore, the power is supplied from the battery to the resistor 6, the level of the switch 1 whose contact point is closed becomes low level, and the level of the switch 1 whose contact point is released becomes high level and is set to the switch 1. The level of the terminal of the gate 1 becomes a high level or a low level according to the information that has been set, and the information set in the switch 1 is read by the microprocessor 2 via the data bus 5.

[0014]

[Effect of the device]

 As described above, according to the present invention, when the information set in the switch group is read, the switching means is made conductive, and the current is supplied from the power supply to the pull-up resistor via the switching means. It has the effect of reducing power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional example of an initialization circuit.

[Explanation of symbols]

 1 Switch 2 Microprocessor 6 Pull-up Resistor 7 Gate 8 Transistor 9 Decode Logic Circuit

Claims (1)

[Scope of utility model registration request] 1. A switch group for initial setting in which one contact is connected to a ground and the other contact is connected to a power source through a pull-up resistor and a switching means, and information set in the switch group. An initial setting circuit, comprising: a control unit that conducts the switching unit when reading.