JPH03129519A - Data processor - Google Patents

Abstract

PURPOSE:To select one necessary bit data out of plural bit data and to output the selected data to an optional output terminal by providing the data processor with a switch circuit and a register. CONSTITUTION:The data processor is constituted of switch circuits 4 to 7 for selecting one necessary bit data out of plural bit data, terminals A to D for inputting or outputting the bit data selected by the switch circuits 4 to 7 and a register 3 for storing data necessary for controlling the circuits 4 to 7. When the register 3 is set up so as to obtain required data, the register 3 outputs a control signal, so that each of the switch circuits 4 to 7 can select one necessary bit data out of plural bit data and output the selected data.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data processing device that processes a plurality of bit data.

Conventional technology A conventional data processing device will be described below.

FIG. 3 shows a block diagram of a conventional data processing device. 1 is a CPU that processes data or controls the entire system; 2 is a program memory that stores programs; output data A, B, C, and D are output and connected to output terminals A, B, C, and D, respectively.

First, the CPU reads instructions from the program memory 2 in which the target program is stored, as shown in the flowchart of FIG. 4(a). The read instructions are then processed within the CPUI.

is executed, and output data A is sent to output terminal A by the data line.
Then, output data B is output to output terminal B, output data C is output to output terminal C, and output data D is output to output terminal R.

Problems to be Solved by the Invention However, in the conventional configuration described above, output data A, output terminal A1, output data B, output terminal B1, output data C, output terminal C1, output data D, and The terminals are only connected one to one. Therefore, when the configuration of the external device is changed due to a design change or the like, there is a problem in that the wiring must be corrected externally to make it compatible with the output terminal of the data processing device.

The present invention solves the above-mentioned conventional problems by selecting necessary bit data from a plurality of bit data,
An object of the present invention is to provide a data processing device that can output data to any output terminal.

Means for Solving the Problem In order to achieve this object, the data processing device of the present invention includes a switch circuit that selects one required bit data from a plurality of bit data, and a bit selected by this switch circuit. It consists of a terminal for inputting or outputting data, and a register for storing data necessary to control this switch circuit.

Effect When the register is set to obtain the desired bit data with the above configuration, the register outputs a control signal, so the switch circuit selects the required bit data from multiple bit data and outputs it. can do.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a data processing device in one embodiment of the present invention. In Figure 1, 3 is a register that stores data necessary to control the switch circuit, and 4, 5, 6, and 7 select one bit of data from among multiple bits of data. This is a switch circuit.

Note that 1 is a CPU and 2 is a program memory, which have the same configuration as the conventional example.

FIG. 2 shows a circuit diagram of the switch circuit and its operation.

The operation of the data processing apparatus of this embodiment configured as described above will be explained.

First, as shown in FIG. 4 (bl), an initial setting program that determines which output terminal the output data will be outputted to is added before the target program used in the conventional example, and the program memory 2 is and store it in C.
When PU1 starts executing instructions in program memory 2,
2-bit data for selecting output data is set in register 3 by the initial setting program. The data in this register 3 determines which terminals output the output data A, B, C, and D. The switch circuit 4 can select only one bit from the 4-bit output data A, B, C, and D and output it to the output terminal A using the 2-bit control signals QAI and QA2 of the register 3. Similarly, the switch circuit 5 is controlled by the 2-bit control signals QBI and QB2 of the register 3, the switch circuit 6 is controlled by the control signals QCI and QC2 of the register 3, and the switch circuit 7 is controlled by the control signals QDI and QD2 of the register 3, respectively. Only one bit of each of the four bits of output data A, B, C, and D can be selected and output to each output terminal. For example, register 3 has QA1=0. QA2
=1. QB1=O, QB2=0. QC1=1. QC2=
1. If you set QD1=1゜QD2=0, QAI
．． When QA2=1, as shown in FIG. 2, the switch circuit 4 sends the output data B to the output terminal A, similarly, the switch circuit 5 sends the output data A to the output terminal B, and the output circuit 6 sends the output data D to the output terminal A.
The switch circuit 7 outputs the output data C to the output terminal C, and the switch circuit 7 outputs the output data C to the output terminal C. In this way, register settings are performed by the initial setting program, and after the initialization of the output terminals is completed, execution of the target program is started. Then, output data A, B, C, D processed by CPUI
are selected by each switch circuit 4 to 7 and output to determined output terminals A, B, C, and D, respectively.

As described above, according to this embodiment, by providing a switch circuit and a register for the conventionally used output data, one necessary bit data can be selected from a plurality of bit data, and any desired bit data can be selected. It can be output to the output terminal.

In the above embodiment, the switch circuit is used only for output, but it may be used only for input or for both input and output.

Effects of the Invention According to the present invention, there is provided an excellent data processing device that is capable of selecting one required bit data from a plurality of bit data and outputting it to an arbitrary output terminal by providing a switch circuit and a register. can be realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a data processing device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a switch circuit, FIG. 3 is a block diagram of a conventional data processing device, and FIG. 4 is a flowchart of a program memory. It is. 1... CPU, 2... Program memory, 3... Register, 4.5, 6.7...
...Switch circuit.

Claims (1)

[Claims] A switch circuit that selects desired bit data from a plurality of bit data, a terminal that inputs or outputs the bit data selected by the switch circuit, and a register that stores data necessary for controlling the switch circuit. A data processing device comprising: