JPH03242747A - Data transmission controller - Google Patents

Abstract

PURPOSE:To reduce the burden of software by manually setting a control data value to a control data set part and generating an interrupt signal to a CPU to perform the control processing in the case of coincidence between this control data value and the value of input data. CONSTITUTION:A control data set part 2 consisting of plural switches and a data comparing part 3 consisting of an exclusive OR circuit are provided, and a control code or the other code is discriminated by hardware. When the value manually set to the control data set part 2 and the value of input data coincide with each other, the interrupt signal is generated from the data comparing part 3 and a CPU 6 is interrupted to perform the control processing, and thereby, the control code or the other code is discriminated by hardware. Thus, the burden of software is reduced, and transmission is performed at a high speed through the data volume is increased, and the control code is easily changed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention detects a control code when data input through a data input section includes a control code and performs corresponding control. The present invention relates to a data transmission control device.

[Conventional technology] FIG. 4 shows a conventional data transmission control of this type.

There was one shown in Figure 5. Figure 4 is a block diagram showing the hardware configuration in conventional data transmission control.
In the figure, (1) is a data input section, (5) is a data line, (6> is a CPU, and (7> is a memory).

Next, the operation will be explained. FIG. 5 is a flowchart showing the operation of conventional data transmission control, and these operations are all processed by software incorporated in the program of the CPU (6).

In the data input routine of step SIO, the data input section (
When data is input from step S11, the control code conveyor section in step Sll determines whether the input data is a control code, and if it is not a control code, it is treated as normal input data and is passed to the data set rule in step S13. Set the relevant data in the memory (7>) using the button.

If the data input in step Sll is a control code, the process moves to step S12, and control processing according to the content is performed.

[Problems to be Solved by the Invention] Conventional data transmission control as described above is performed as described above, and it is constantly determined by software whether or not input data is a control code, so the amount of data increases. In this case, the burden on the software becomes large and high-speed transmission becomes difficult.

Furthermore, when changing the control code, the software must be changed significantly, and the control code cannot be changed easily.

This invention was made in order to solve such problems, and provides a data transmission control device that can reduce the burden on software, perform high-speed transmission even when the amount of data increases, and can easily change control codes. The purpose is to obtain.

Although there are various prior technologies aimed at reducing hardware and software, as seen in Japanese Patent Application Laid-Open No. 1-94741, "Interrupt Control Method for Communication Control Devices," all of these methods and devices are complicated. The problem remains that it cannot be easily realized at low cost.

[Means for Solving the Problems] A data transmission control device according to the present invention includes a control data setting section made up of a plurality of switches and a data conveyor section made up of an exclusive OR circuit, and has a control data setting section made up of a plurality of switches and a data conveyor section made up of an exclusive OR circuit. can be performed using hardware.

[Operation] The data transmission control device according to the present invention generates an interrupt signal from the data conveyor section to interrupt the CPU and performs control when the value manually set in the control data setting section matches the value of the input data. By performing the processing, hardware determines whether or not it is a control code.

[Example] An example of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the same reference numerals as in FIG. 4 indicate the same or corresponding parts, and (2
) is the control data setting section, (3) is the data conveyor section,
4> is an interrupt signal line.

Figure 2 is a connection diagram showing the configuration of the control data setting unit (2) and data conveyor unit (3) shown in Figure 1. It is equipped with a control data value setting switch (20) consisting of a switch that can input a value, while the data conveyor section (3) has the same number of X bits as the number of bits of input data.
OR (exclusive OR) gate (30) and one multi-input O
R gate (31), each XOR gate (30
) is connected to each switch of the control data value setting switch (20), and the other terminal receives one bit of input data, respectively.

Next, the operation will be explained. Figure 3 is the same as Figure 1.

In the flowchart showing the operation of the data transmission control device shown in FIG. ” (i.e. level rH”,
rL"). When data is input from the data input section (1>), the data is
The level rH for each bit is input to the OR gate (30) and set by the control data value setting switch (20>).
, 'LJ, and in each XOR gate (30〉), if the levels match, the output is rl, J. And in the multi-input OR gate (31), all XOR gates (30〉)
(1) When the output is “L”, that is, the data input section (1
) When each bit of data input from CPU (6) matches each bit of control data set in control data setting switch (20), the output is set to "L", and
) to notify that the input data is a control code by generating an interrupt signal (4).6 and above are the operations of steps S3 to S5 shown in the right diagram of FIG.

On the other hand, the input data and the set control data are 1
If the bits also differ, a multi-input OR gate (31)
The output of is kept in the "H" state, and in this case, the data is set in the memory (7>) by steps Sl and S2 shown in the left diagram of FIG.

In this way, only when the input data is a control code, an interrupt is made to the CPU (6) to perform control processing, so it is difficult to judge whether each input data is a control code or not. There is no need to use software to do this, reducing the burden on the software.

Note that although the above embodiment describes the case of data input, the same implementation as in the above embodiment can also be performed in the case of data output.

Furthermore, in the above embodiment, the interrupt signal (4) is directly transmitted to the CP.
Although the control code is input to tJ (6), a display mechanism may be provided in between, and this display device may be used as a monitor to confirm when a control code is input.

[Effects of the Invention] As explained above, this invention manually sets a control data value in the control data setting section, and generates an interrupt signal to the CPU when the control data value matches the input data value. Since we decided to have control processing performed by the system, the burden on the software can be significantly reduced, high-speed transmission is possible even when the amount of input and data increases, and control data can be changed with almost no changes to the software. It has the advantage of being easy to implement at low cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a connection diagram showing the configuration of the control data setting section and data conveyor section shown in FIG. 1, and FIG. 3 is a flowchart showing the operation of the embodiment. , FIG. 4 is a block diagram showing the conventional configuration,
FIG. 5 is a flowchart showing the operation. In the figure, (1) is the data input section, (2) is the control data setting section, (3> is the data conveyor section, (4> is the interrupt signal line, (5> is the data line, (6) is the CPU, (7) is the
) is memory, (20> is control data value setting switch,
(30) is an XOR gate, and (31) is a multi-input OR gate. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A data transmission control device that detects a control code that is included in data that is input through a data input section and performs control processing according to the content of the control code. The control data setting section that is manually set compares the control data set in this control data setting section with the data input from the data input section above, and if both data match, control is performed according to the content. A data transmission control device comprising: a data conveyor unit that interrupts the CPU to perform processing.