JPH0258122A - Display device - Google Patents

Abstract

PURPOSE:To obtain a display device which effectively displays static numerical information and dynamic condition information by switching two code converting circuits and using them. CONSTITUTION:When the condition of an information processor is displayed on a display device 15, by making a signal line 26 effective, a selector circuit 14 selects a second code converting circuit 13 instead of a first code converting circuit 12. The four-bit information of a register circuit 11 is converted so that the data of lower-order three bits in the register circuit 11 may drive respective elements 35, 36 and 37 of the display circuit 15 in the second code converting circuit 13, and sent through a signal line 24, the selector circuit 14 and a signal line 25 to the display circuit 15. Thus, the screen can be switched to the numerical displaying and the condition displaying, and the change of the condition can be recognized by visual observation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device that displays the status of an information processing device such as a computer, and in particular to a display device that displays the status of an information processing device such as a computer by switching one display device between displaying numerical values and displaying the status. Regarding display devices that can be used.

[Conventional technology]

Conventionally, a display device for displaying the status of an information processing device is provided with a lamp in one-to-one correspondence with each bit of data, and the data is displayed based on whether each lamp is turned on or off. There is a method that divides data into groups of several bits and displays the contents of each group as a numerical value such as octal or hexadecimal, but recently the latter method has been used because it is easier to read the data as a numerical value. is becoming popular.

[Problem to be solved by the invention]

The conventional method described above, which divides data into groups of several bits and displays the contents of each group as a numerical value, can be used to display the status of an information processing device from moment to moment. Since the changing state is displayed as a change in numbers, there is a drawback that it is difficult to visually recognize the change in the state.

[Means to solve the problem]

The display device of the present invention includes a register circuit that stores data, a first code conversion circuit that converts the output of the register circuit according to a predetermined rule, and a first code conversion circuit that converts the output of the register circuit into the first code. a second code conversion circuit that converts according to rules different from those of the conversion circuit; a selection circuit that selects and outputs either the output of the first code conversion circuit or the output of the second code conversion circuit; and a display circuit that displays the output of the selection circuit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. As shown in FIG. 1, the display device of the present invention includes a register circuit 11. A first code conversion circuit 12 and a second code conversion circuit 13 connected to the register circuit 11, the first code conversion circuit 12
and a selection circuit 149 connected to the second code conversion circuit.
It consists of a display circuit 15 connected to the output of the selection circuit 14.

In the embodiment of FIG. 1, the simplified register circuit 1
1 is capable of storing 4-bit information. Further, it is assumed that the display circuit 15 has eight display elements as shown in FIG.

When displaying on the display circuit 15 in FIG. 1, 4-bit data from the register circuit 11 is sent to the first code conversion circuit 12 via the signal line 21 and converted into 7-bit data. This 7-bit data is sent to the signal line 232 selection line circuit 14. is sent to the display circuit 15 via the signal line 25,
Each of the seven bits of data is transmitted to seven elements 31. of the display circuit shown in FIG. ~37 is driven. FIG. 3 is a state diagram of the display of the display circuit 15 with respect to the contents of the register circuit 11. Data in the figure shows the contents of the register circuit 11, and display 1 shows the state of the display of the display circuit 15.

When displaying the status of the information processing device on the display device 15, by enabling the signal line 26, the selection circuit 14 selects the second code conversion circuit 1 instead of the first code conversion circuit 12.
Select 3. The 4-bit information of the register circuit 11 is transferred to elements 35 and 3 of the display circuit 15 in the second code conversion circuit.
6°37 respectively, and the signal line 2
4. Selection circuit 14. The signal is sent to the display circuit 15 via the signal line 25. Data in FIG. 3 shows the contents of the register circuit 11, and display 2 shows the display state of the display circuit 15.

As a specific usage example of the display device of the present invention, when an error is detected in the self-diagnosis of the information processing device, the error code can be displayed on the display circuit 15 as a hexadecimal number. If no error is detected, the display element 36 indicates that the information processing device is able to execute the command by lighting the display element 35 in FIG. 2, for example, indicating that the information processing device is executing the command. In other words, the display element 37 can display that an abnormality in the information processing device has been detected during instruction execution.

〔Effect of the invention〕

As explained above, the present invention has the advantage of being able to effectively display static numerical information and dynamic status information by switching and using two code conversion circuits.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
Pattern diagram of display elements of display circuit shown in figure 3
The figure is a state diagram of the display of the display circuit of FIG. 1. DESCRIPTION OF SYMBOLS 11... Register circuit, 12... First code conversion circuit, 13... Second code conversion circuit, 14... Selection circuit, 15... Display circuit, 31. 32-37... Element .

Claims (1)

[Claims] a register circuit that stores data; a first code conversion circuit that converts the output of the register circuit according to a predetermined rule; and a first code conversion circuit that converts the output of the register circuit according to a rule different from that of the first code conversion circuit. a second code conversion circuit that selects and outputs either the output of the first code conversion circuit or the output of the second code conversion circuit; and a selection circuit that displays the output of the selection circuit. A display device comprising a display circuit.