JPH0632053B2 - Integrated circuit device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an integrated circuit device incorporated in a home electric appliance such as a microwave oven, an electromagnetic cooker, and the like. The present invention relates to a switching means of an integrated circuit device, a part of which is switchable.

<Prior art> There are many home appliances on the market that have integrated circuits (microcomputers) and are designed to improve their functions. The fact is that integrated circuits with exactly the same program software cannot be installed because of different reasons. In addition, it is not allowed in cost to separately build integrated circuits with different parts of program software. Conventionally, various kinds of program software with partially different condition settings were incorporated into one integrated circuit, and also for switching program software. There was an input port to switch some condition settings. However, in that input port, only one bit can be switched by one input port, and therefore, for example, if 6 bits are switched, as shown in FIG. 4, six bits S _{0 to} S ₅ are selected. input port is required, must be performed to switch depending recognition if S ₀ to S ₅ Mr. input port is grounded, it was a great burden to provide more input ports for the integrated circuit.

<Purpose> The present invention has been made in view of the above, and is an integrated circuit device capable of switching a part of program software and outputting a digit signal to a display device. The number of ports can be reduced and the cost of the integrated circuit device can be reduced by providing an input port for taking in the bit signal and switching the partial condition setting of the program software by the digit number bit signal input to the input port. The purpose is to measure.

<Example> An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram for explaining the integrated circuit device of the present invention. Reference numeral 1 in the figure denotes an integrated circuit (LSI) usually called a microcomputer, and a buzzer 3 for alarm sound based on a key input or a detection input from an input device 2 by a built-in program, or a control device 4 such as a relay.
Controls the display tube 5 and the like. The display tube 5 is generally controlled by dynamically driving segment signals and digit signals. In the present invention, the digit signal (6 digit signal output from the D _{1 to} D ₆ ports) is selectively taken out through the diodes 6, 6, 6 ... And the input port S ₇ for program software switching is selected.
The input signal is a 6-bit switching signal. The use of the diode 6 for extracting the digit signal is for separating each digit of the digit signal, and the input port S ₇ is _pulled down to the power supply V _DD of the LSI through the resistor 7. There is.

Next, switching of program software according to the present invention will be described. D
₁ to D digit signal output from the ₆ port as shown in Figure 2, a rectangular wave pulse is time-divided into 1～2Msec, sequentially digit from D ₁ to D ₆ port according the flow chart shown in FIG. 3 A signal is output and S is passed through the diode 6.
The digit signals of the digits (all digits in FIG. 1) connected to the ₇ port are read as “High” from the S ₇ port,
It is determined which digit signal output port of D _{1 to} D ₆ the digit signal at that time is, and “1” is set to the program software switching flags F _{1 to} F ₆ corresponding to the signals of D _{1 to} D ₆ ports. To be done.

It is possible to switch the program software in the above manner to "1" set to desired program software corresponding to the switch flag digit signal output port only a 6-bit be connected to an input port S ₇ through the diode 6 signal it can. That is, one output port S ₇ can switch a large number, and the number of ports can be reduced and the cost can be reduced by a simple switching means (connection via a diode).

If the number of digits is to be switched, short-circuit connection may be made for each digit.

<Effect> The present invention is an integrated circuit device in which a part of program software can be switched and which has a plurality of output ports for outputting a time-divided digit signal to a display device. An input port for reading a signal of a digit number of digits and connecting the input port to the output port, and determining from which output port the signal of the digit number of bits input to the input port is , By switching a part of the program software to the program software corresponding to this judgment result, it is possible to reduce the cost by reducing the number of ports of the integrated circuit. Moreover, by using the time-division digit signal, input By simply connecting the port and output port, you can automatically switch a part of the program software to the corresponding program software, and operate the input key etc. Can be omitted in grams soft switching operations, it is possible to measure the time reduction of the product of the production process using the integrated circuit.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an integrated circuit device of the present invention, FIG. 2 is a waveform diagram of a digit signal, FIG. 3 is a flow chart for explaining switching of the present invention, and FIG. 4 is a conventional integrated circuit device. It is a schematic explanatory view of the switching means of. Reference numeral 1 ... Integrated circuit, 5 ... Display tube, 6 ... Diode, D
…… Digit signal, S ₇ …… Input port for switching.

Claims (1)

[Claims] 1. An integrated circuit device having a plurality of output ports capable of switching a part of program software and outputting a time-divided digit signal to a display device, the digit being formed from the digit signal. An input port for reading a signal of several bits is provided, the input port is connected to the output port, and it is determined from which output port the signal of the digit number of digits input to the input port is, An integrated circuit device characterized in that a part of software is switched to program software corresponding to the result of this judgment.