JPS62146038A - Communication control equipment - Google Patents

Abstract

PURPOSE:To economize a data reception processing time to execute another job by holding a retriggerable monostable multivibrator circuit in the set state during reception of one packet to inhibit the interrupt signal input from a serial/ parallel converting circuit if data which is not destined for a device itself is received. CONSTITUTION:A series of reception serial data pass a receiving circuit 3 and are converted to parallel data by a serial/parallel converting circuit 4 and are outputted, and simultaneously, an interrupt signal is generated and is inputted to a retriggerable monostable multivibrator circuit 6 and a gate circuit 7. Since the circuit 6 is in the reset state by the signal of a control circuit 5 and the circuit 7 is in the open state normally, the interrupt signal is inputted to the control circuit 5 to read parallel data from the converting circuit 4. Data are received successively; and if data are not destined for the device itself when address data is received, the monostable multivibrator circuit 6 is released from the reset state and is set to the triggerable state, and the interrupt signal is inputted to generate an output signal having a certain pulse width, and this signal is inputted to the gate circuit 7, but a gate output signal is not outputted in the other input terminal 72 because the gate is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication control device that performs data communication using a multi-drop method, either by wire or wirelessly.

Conventional technology A communication control device using a conventional multi-drop method has a third
As shown in the figure, when serial data is received from the communication line 11, it is converted into parallel data byte by byte by the serial/parallel conversion circuit 14 via the reception circuit 13, and an interrupt signal is generated every time the conversion is completed. Then, this interrupt signal requests the control circuit 16 to read the data.

When the control circuit 15 receives the interrupt signal, it reads the received data one byte at a time from the serial/parallel conversion circuit 14, and if the data is addressed to itself, the control circuit 1
5 performs processing necessary for data communication such as error processing, and then outputs to a terminal (not shown) via a transmitting circuit 12.

On the other hand, if the data is not addressed to itself, it discards all the received data for one bucket and waits until the next packet addressed to itself is received.

Problems to be Solved by the Invention However, in the conventional communication control device described above, all data addressed to itself and other data are taken into the control circuit, and the control circuit judges whether the data is addressed to itself or not. However, since the system is such that only the data addressed to itself is taken in and all other data is discarded, processing time is also required to process the reception of data addressed to other than the self. The problem arises in that the more communication control devices are connected to a communication line by multi-drop, the more time is wasted in receiving data other than those addressed to the device itself.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a communication control device that can shorten the time required for processing to receive data that is not addressed to itself.

Means for Solving the Problems In order to achieve the above object, the present invention provides a transmission circuit for transmitting data on a communication line, a reception circuit for receiving data from the communication line, and a control circuit. A serial/parallel conversion circuit for converting parallel data into serial data, a retriggerable mono-multi circuit driven by the interrupt signal from the serial/parallel conversion circuit, and a retriggerable mono-multi circuit for converting the above interrupt signal. It is equipped with a gate circuit that is controlled by the output of the circuit, and a control circuit that exchanges parallel data with the serial/parallel conversion circuit.

According to the above-described configuration, the present invention keeps the retriggerable monomulti circuit in the set state while receiving one packet when the control circuit determines that the received data is not addressed to itself, and sends the output signal to the gate circuit. By inputting the interrupt signal from the serial/parallel converting circuit to the control circuit, the time spent when receiving data other than the one addressed to itself is not used.

Embodiment FIG. 1 is a block diagram showing a communication control device according to an embodiment of the present invention. In FIG. 1, 1 is a multi-drop type communication line, 2 is a transmitting circuit for transmitting data to the communication line 2, and includes a data input terminal 22 and a data output terminal 21.
has. A receiving circuit 3 receives real data from the communication line 2, and has a data input terminal 31 and a data output terminal 32. 4 is a serial/parallel conversion circuit, which has a /real data output terminal 41, a serial data input terminal 42, a parallel data input/output terminal 43, and an interrupt signal output terminal 44. 5 is a control circuit, which includes a parallel data input/output terminal 51, an interrupt signal input terminal 52, and IJ1. A control signal output terminal 53 for controlling the reconfigurable mono multi-circuit 6 and a terminal (not shown) side data bus input/output terminal 54
has. Reference numeral 6 denotes a retriggerable monomulti-circuit, which has an interrupt signal input terminal 61, a gate control signal output terminal 62, and a set/reset control signal input terminal 63. A gate circuit 7 has an interrupt signal input terminal 72, a gate control signal input terminal 71, and a gate signal output terminal 73.

To further explain the operation of the communication control device having the above configuration, when a series of data as shown in FIG. The signal is input to the conversion circuit 4.

The serial/parallel conversion circuit 4 converts the data into parallel data and outputs it, and at the same time generates an interrupt signal.

The interrupt signal is input to the retriggerable monomulti circuit 6 and the gate circuit 7. The retriggerable mono multi-circuit 6 is normally in a reset state by a control signal from the control circuit 5, the gate circuit 7 is in an open state, and the interrupt signal is transmitted to the control circuit via the gate circuit 7. 5
is input.

When the interrupt signal is input, the control circuit 6
Read parallel data from parallel conversion circuit 4.

According to the above sequence, data is received one after another, but when address data is received, it is determined whether the data is addressed to the self or not, and if the data is addressed to the self, data reception is continued in that state. continue. On the other hand, if the data is not addressed to itself, the retrigger pull mono multi circuit 6
Cancels the reset and makes it possible to trigger. When an interrupt signal is input in such a state, the retriggerable monomulti circuit 6 is triggered, generates an output signal having a constant pulse width, and inputs it to the gate circuit 7. An interrupt signal is input to the other input terminal 72 of the gate circuit 7, but since the gate is in a closed state, no gate output signal is output.

Now, if the time constant of the retrigger pull mono multi circuit 6 is set longer than the data interval (byte-to-byte time interval) T received from the communication line 1, the remaining series of data (one packet worth) During reception, the retriggerable monomulti circuit 6 always outputs a control signal, so no interrupt signal is input to the control circuit 5.

On the other hand, the control circuit 5 reads the output state of the IJ) removable mono multi-circuit 6 at an appropriate timing, and after confirming that the output signal is no longer present, sets the IJ removable mono multi-circuit to a state where it is in a stable condition. Return to initial state.

Effects of the Invention As mentioned above, by preventing the hardware from inputting an interrupt signal when receiving data that is not addressed to the user, the time required for data reception processing can be saved, and that time can be used for other jobs. (for example, terminal control).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a communication control device according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of the device, and FIG. 3 is a block diagram of a conventional communication control circuit. . 1...Communication line, 2...Transmission circuit, 3
...Receiving circuit, 4...Serial/parallel conversion circuit, 6...Control circuit, 6...
・Retriggerable mono multi-circuit, 7...gate circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
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Claims (1)

[Claims] A communication control device that performs data communication using a multi-drop method using wired or wireless communication, comprising a transmitting circuit for transmitting data onto a communication line, and a receiving circuit for receiving data from the communication line. , a serial/parallel converter circuit for converting parallel data between control circuits into serial data, a retriggerable monomulti circuit driven by an interrupt signal from the serial/parallel converter circuit, and the interrupt signal a gate circuit that controls the output of the retriggerable monomulti circuit, and a control circuit that exchanges parallel data with the serial/parallel conversion circuit, and the control circuit controls the output of the data received from the communication line. By determining the address data, it is determined whether the data is addressed to the self,
If the data is addressed to the self, the data following the address data is taken in continuously, and if the data is not addressed to the self, the retriggerable monomulti circuit is held in the set state while one packet is being received, and the output is A communication control device characterized in that inputting a signal to the gate circuit inhibits an interrupt signal from the serial/parallel conversion circuit from being input to the control circuit.