JPS61208122A - Small-sized arithmetic unit - Google Patents

Abstract

PURPOSE:To transfer data from a CPU for arithmetic to a display control means efficiently by carrying out conversion to data for conversion by a data converting means before data to be displayed is outputted to a display control means. CONSTITUTION:When a display switching signal 1000 is inputted from an input circuit 10, this signal 1000 is counted 60, and the counted value is decoded 61, thereby outputting a display switching signal 1006 which indicates what is displayed next to the CPU 30 for arithmetic. When data stored in an area in a temporary storage circuit 100 is specified by the display switching signal 1006 as the data to be displayed next, the arithmetic result in the area A is code-converted by a data converting circuit 50 into data for transfer, which is stored in an area for transfer data. Then, data displayed currently on a display body 100 is transferred from a data memory 111 for display data and stored in the area A of the temporary storage circuit 100 through a display data input circuit 70. Further, the data in the area for transfer data is outputted to the data memory 111 for display through a display data input/output circuit 70.

Description

[Detailed description of the invention] [Industrial use parts] The present invention relates to display switching means for a small-sized arithmetic device.

[Summary of the invention]

In the display switching means of a small arithmetic device, the present invention first converts the calculation result to be displayed into a code for data transfer in response to an external display selection signal, and further converts the currently displayed data into a code for data transfer. By storing the data to be displayed in a temporary memory circuit directly connected to the CPU for calculation and then outputting it to the display control means, many calculation results can be stored regardless of the capacity of the data memory on the display control means side. This allows for switching display, and the result calculated once is retained no matter how many times the display is switched.

[Prior art]

Traditional small computing devices (especially watches, electronic desktop calculators, etc.)
For the purpose of low power consumption and miniaturization, one CPU
It has an arithmetic circuit, a memory circuit (RoM), a temporary memory circuit (RAM) inside, and a display control circuit that can directly drive an LC!D (liquid crystal display), etc., making it a complex device. When performing multiple types of calculations, most of the internal RAM is used as a work area for calculations, so it is not possible to temporarily store multiple calculation results. , the calculation had to be redone.

[Problems and Objectives to be Solved by the Invention J However, although the above-mentioned conventional technology has advantages in terms of low power consumption and miniaturization, the calculation speed for watches is slow and the accuracy is insufficient. In addition, in the conventional technology, the capacity of the temporary memory circuit is limited, so when attempting to perform complex calculations, most of the temporary memory circuit is used as a work area for calculations, so a large number of It was not possible to store calculation results, and it was necessary to perform calculations each time the display was switched. As a result, the previous calculation result is destroyed on the temporary storage circuit, and there is a problem in that it takes a very long time to switch the display.

Therefore, the present invention aims to solve these problems.
The aim is to create a small arithmetic device that has low power consumption, maintains a compact size, and can quickly switch displays by storing a large number of complex arithmetic results in an external temporary memory circuit. It is located in a place that provides.

[Means for Solving the Problems] The small-sized arithmetic device of the present invention includes at least an arithmetic CPU controlled by an external signal, a temporary storage means from which data can be directly read and written by the CPU, and the arithmetic CPU controlled by an external signal.
display selection means for selecting which one of the plurality of calculation results calculated by pu to display; display control means for converting the selected calculation result into display data; and a display for displaying the display data. a) a startup control means for stopping and starting the operation of the arithmetic CPU in accordance with a signal from the display selection means and an external arithmetic start signal; b) a plurality of arithmetic operations of the arithmetic CPU; C) a calculation result writing means for storing the result in the temporary storage means; C) data conversion means for selecting the calculation result selected by the display selection means from the temporary storage means and converting the data into a code for data transfer; The display switching means stores the currently displayed calculation result in the temporary storage circuit after data conversion by the display selection means, and then outputs the data converted nine calculation results to the display control means. characterized by things.

[For production]

According to the above configuration of the present invention, the activation control means operates upon receiving a calculation start signal from the outside, and the calculation CPU starts calculation based on necessary data.

The calculation results are sequentially stored in the temporary storage circuit by the calculation result writing means.

Normally, one of the results of these calculations is sent from the calculation CPU to the data conversion means, converted into a code for transfer, and then output to the display control means and displayed on the display. Thereafter, when a display switching signal is input from the outside, the calculation result selected by the display selection means is selected from the temporary storage means, and first code converted by the data conversion means. Thereafter, the currently displayed calculation result is written into the temporary storage circuit from the display control means. After this is completed, the code-converted data is output to the display control means via the calculation CPU and displayed on the display.

[Embodiment J FIG. 1 is a circuit block diagram of a small-sized arithmetic device in an embodiment of the present invention.

Input circuit consisting of 10 switches or keyboard, etc. 2
0.21 is an oscillation control circuit and an oscillation circuit which are the activation control means for the calculation CPU. 30 is cp for calculation
u, 40 is a calculation result writing circuit; 50 is a data conversion circuit that converts the calculation result into data for transfer; 60 and 61 are counters that count switch signals from the input circuit and perform display selection by converting the codes; It is a decoder and constitutes display selection means. A display data input/output circuit 70 inputs and outputs display data in response to the display selection signal 1006, and constitutes display switching means.

100 is a display body such as a liquid crystal; 110 and 111 are display control circuits and display data memories, which constitute display control means;
1000 is a display changeover switch input, 1001 is an arithmetic control signal for controlling the start/stop of arithmetic operations, 1002 is a clock for the arithmetic CPU, 1005 is a data bus, and 1004 is an address bus.

First, when the calculation start signal 1001 is input from the input circuit 10, the oscillation control circuit 20 determines the signal and drives the oscillation circuit 21. From the oscillation circuit 21 to the calculation cp
A calculation clock 1002 is supplied to u50.
The calculation CPU performs at least one operation on data given in advance, and stores the results one after another in the temporary storage circuit 90. This state is shown in FIG. The results are stored in the order of area A, area B, etc. by the calculation result writing circuit 40.
All arithmetic programs at that time are stored in the storage circuit 80. After the calculation is completed, the fifth calculated result is converted into data for transfer in the data change circuit, sent to the transfer data area in the temporary storage circuit, and then sent via the data bus 1003'i. The data is sent from the calculation CPU 30 to the display data input/output circuit 70 and stored in the display data memory 111. This data is decoded by the display control circuit 110 and the display body 10 [+
to be displayed.

Next, when the display switching signal 1000 is inputted from the input circuit 10, the counter 60 counts the signal 1000, and the decoder 61 decodes the value.
A display switching 1006 'i indicating how many items should be displayed next is output to the pu30.

Now, by the display switching signal 1006, the temporary storage circuit 10
The data stored in area A within 0 will be displayed next. In this case, as shown in FIG. 2, the calculation result in area A is converted into a code for data transfer in the -1 data conversion circuit 50, and is stored in the transfer data area. Next, the data currently displayed on the display body 100 is stored in area A of the temporary storage circuit 100 from the display data memory 111 via the display data input/output circuit 70.

In this way, after the current display data is saved in the temporary storage circuit 10a, the data in the transfer data area is first output to the display data memory 111 via the display data input/output circuit 70t. .

When the series of data conversions as described above are completed, a completion signal 1007 is output to the oscillation control circuit 20. Upon receiving the end signal 1007, the oscillation control circuit 20 stops the oscillation circuit 21, the supply of the clock 1002 is stopped, and the operation of the arithmetic CPU is stopped.

Figure 3 is an example diagram of display switching, April 3, 1985.
Display changeover switch 11 to display the calculation result of 0WASK on day 0 (using the calculation formula for calculating the high and low tide as an example calculation)
The result has been changed to the KOOFIN calculation result on May 30, 1985.

Note that the embodiments listed here are merely examples, and the present invention is not particularly limited thereto.

〔Effect of the invention〕

As described above, the present invention has a startup control means that operates the calculation CPU controlled by an external signal only when executing calculations and switching displays, so the power consumption of the entire device is reduced to the necessary minimum. It has the effect of being able to hold down to a limit.

Further, in the present invention, since a plurality of calculation results are stored in a temporary storage circuit directly connected to the calculation CPU, the plurality of calculation results can be stored regardless of the storage capacity on the display control means side. Therefore, display switching can be performed quickly. Furthermore, since the contents of the memory on the display control means side are temporarily saved in the temporary storage circuit, the memory of the display control means can also be used as an extension of the memory for storing calculation results, making it even more convenient. Effective memory utilization is at stake. Moreover, there is no need to redo calculations each time the display is switched, and there is an effect that the display can be switched more quickly.

cJ! Furthermore, before outputting the data to be displayed next to the display control means, the data is converted for transfer in the data conversion means in advance, so data can be more efficiently transferred from the calculation CPU to the display control means. It has the effect of making it possible to steal.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram of a small-sized arithmetic device of the present invention, and FIG. 2 is a conceptual diagram of an arithmetic result temporary storage circuit of the present invention. FIG. 3 is a diagram showing display switching according to the present invention. In the figure 10... Input circuit 20... Oscillation control circuit 2
1...Oscillation circuit 30...Arithmetic cp+
x40...Arithmetic result writing circuit 50...Data conversion circuit 60...Counter 61...
...Decoder 70...Display decoder included 80.
...Memory circuit output (b) path 90...←Time memory circuit 100...Display body 110...Display control circuit 111...Display data memory and above Applicant Suwa Seikosha Co., Ltd. Agent Person Patent Attorney Mogami 9Q Temporary Interview Salary Figure 2 ■ Figure 3

Claims (1)

[Claims] A computing CPU controlled by at least an external signal;
A storage means for storing programs of the CPU, a temporary storage means for directly reading and writing data by the CPU, and displaying any one of a plurality of calculation results calculated by the calculation CPU. a) a signal from the display selection means; a display control means that converts the selected calculation result into display data; and a display body that displays the display data; and start control means for stopping and starting the operation of the arithmetic CPU in accordance with an external arithmetic stop start signal; b) an arithmetic result writing means for storing a plurality of arithmetic results of the arithmetic CPU in the temporary storage means; c) ) data conversion means for selecting the calculation result selected by the display selection means from the temporary storage means and converting the data into a code for data transfer; d) data conversion means for selecting the calculation result selected by the display selection means from the temporary storage means; A display for storing the currently displayed calculation result in the temporary storage circuit after data conversion by the data conversion means, and then outputting the data-converted calculation result to the display control means. A small arithmetic device characterized by having a switching means.