JPS60239858A - Data transmission/reception system - Google Patents

Abstract

PURPOSE:To reduce the size of a port for discriminating transmitted received data and to provide the port with a fixed constitution even if the number of data transmitted/received between microcomputers is different by using a status discrimination signal line and a transmitted data updating discrimination line. CONSTITUTION:When data are to be transmitted from a microcomputer 1a to a microcomputer 2a, a microprocessor MPU3 turns the status discrimination signal line 17 to the ''1'' level through an address decoder 5 and a sent data discriminating port 9a. Then, the MPU3 specifies a data output port 10, writes the sent data in parallel and inverts a signal on the sent data updating discrimination signal 20 to the ''H'' level through a decoder 5 and the port 9a. An MPU4 detects the status of the signal line 17 and the discrimination line 20 and reads the data from the port 10 in parallel through a data input port 12. Thereafter, the updating of the data can be discriminated by inverting the signal on the discrimination line 20 in every updating of the data, so that the discrimination can be executed only by one discrimination line 20. Thus, the discrimination port can be reduced at its size and provided with a fixed constitution.

Description

Detailed Description of the Invention (a) 1. Technical Field of the Invention The present invention relates to a data exchange method for continuously transmitting and receiving data between two systems of microcomputers in one device in real time, and in particular, to Concerning improvements in transmitting data.

(b), Background of the Technology Recently, there has been a strong desire to standardize component parts in electronic communication devices in order to make them more economical. This is no exception when a large amount of data is exchanged between two systems of microcomputers within one device.

(C), Prior Art and Problems Regarding the conventional method of exchanging data between two systems of microcomputers in one device, using the example shown in Figure 1, microcomputer 1 and microcomputer 2 are To explain the case of transmitting data, when transmitting data, the microprocessor (hereinafter referred to as MPU) 3:
The address decoder 5 instructs the port 9 for identifying sending data, and the signal from the data bus 15 sets the state identifying signal line 17 as a level. The MPU 4 periodically instructs the reception data identification port 11 through the address decoder 7, monitors the state of the state identification signal line 17 via this, and learns that the data will be transmitted as a signal.

Next, the MPU 3 uses the address decoder 6 to instruct the data output port 10, and writes the output data thereto in parallel via the data bus 15.

On the other hand, the address decoder 5 instructs the port 9 for identifying sent data, writes the order of the sent data, for example, 001, to the port 9 for identifying sent data via the data bus 15,
The three data order identification signal lines 18 are each set to 001. The MPU 4 periodically instructs the received data identification port 11 using the address decoder 7 and monitors the three data order identification signals wA 18 via the address decoder 7. When the MPU 4 detects the first data transmission, the address decoder 8 The data input port 12 is designated by the data input port 12, and the data written to the data output port 10 is read in parallel via the data output line 19, the data input port 12, and the data bus 16.

Next, in the same way as above, the three data order identification signal lines 18
becomes 010, the second data written to the data output port 10 is transferred to the data output line 19. Data input boat 12. Read in parallel via data bus 16.

The above operation continues until the last data to be sent. When there is no more data to be sent, the MPU 3 uses the address decoder 5 to instruct the port 9 for identifying sent data, and sets the state identifying signal line 17 to 0 level by a signal from the data bus 15.

The MPU 4 periodically instructs the reception data identification port 11 using the address decoder 7 and monitors the status of the status identification signal line 17 via this, so it knows that the data has become 0 level and identifies the data. Recognize that the giving and receiving is over.

Data is exchanged in this way.

However, in this method, if the number of sent data is 2=8, only three data order identification signal lines are required per day, and the sent data identification port 9 and the received data identification port 11 are of three blocks corresponding to this. However, for example, if the number of transmitted data is 2-64, six data order identification signal lines 18 are required, and correspondingly six blocks are required for the transmitted data identification port 9 and the received data identification port 11. Become large scale. The larger the number of data to be sent, the larger the scale. This means that if you attempt to mass-produce the sending data identification port 9 and the receiving data identification ports 1-11 and make them common in order to make them economical, you will have to use the maximum number of sending data, which will be expensive. , which is a cause of impediment to commonality.

(d) 1. Purpose of the Invention In view of the above problem, the purpose of the present invention is to solve the problem even if the number of sending data exchanged between two systems of microcomputers is different.
The purpose of the present invention is to provide a data exchange method that allows a boat for identifying sent data and a boat for identifying received data to have a small-scale and constant configuration.

(e) 0 Structure of the Invention The above object is to connect the sent data identification boat of the transmitting side and the receiving side when data is continuously exchanged in real time between two microcomputers in one device. This book has a received data identification port that uses two signal lines: a status identification signal line that indicates whether data is being sent or not, and a sending data update identification line that inverts the polarity each time the sending data is updated. This is achieved by the configuration of the invention.

In other words, each time the transmitted data is updated, the data update is identified by inverting the polarity of the signal instead of indicating the order of the data, so that the data can be transmitted in a small-scale fixed configuration that does not depend on the number of data. This allows data to be transferred between a data identification boat and a received data identification boat.

(f) 0 Examples of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a time chart of waveforms of each part in FIG.
C) corresponds to points a, b, and c in FIG.

In addition, the same reference numerals indicate the same functions throughout the figures, la,
lb is a microcomputer, 9a is a port for identifying sending data, lla is a port for identifying receiving data, and 20 is a sending data update identification line.

The difference between FIG. 2 and FIG. 1 is that the data order identification signal line 1
8 is replaced by one sending data update identification line 20,
The point is that the transmitted data identification boat 9 and the received data identification boat 10 are made into one block of corresponding transmitted data identification port 9a and received data identification boat 10a.

Microcomputer 2 from Microcomputer 1a
To explain the case of transmitting data to port a, as in the case of transmission, the MPU 3 uses the address decoder 5 to instruct the sending data identification port 9a, and uses the signal from the data bus 15 to select the state identification signal line. 17 in Figure 3 (A
). The MPU 4 periodically uses the address decoder 7 to instruct the reception data identification port 11a, monitors the state of the B identification signal line 17 via this, and learns that the received data will be transmitted as a label.

When sufficient time has elapsed for this to be known, as shown in a in FIG. Write A in (C) in parallel.

On the other hand, the address decoder 5 instructs the transmission data identification port 9a, and as shown in FIG. 3(B), the signal on the transmission data update identification line 20 is inverted via the data bus 15 and set to H level.

Since the MPU 4 periodically instructs the reception data identification port 11a in the address decoder 7 and monitors the sending data update identification line 20 via this, the MPU 4 detects that it has been reversed and sends the address decoder 8 to the reception data identification port 11a. to the data input port 12, and the data output line 19. Data input boat 12. The data shown in FIG. 3(C) A written in the data output port 10 is read in parallel via the data bus 16.

Next, the MPU 3 writes the sending data shown at the opening in FIG. 3(C) to the data output boat 10 in the same manner as above, and waits for sufficient time for the above reading shown at b in FIG. 3(B). For example, in the same manner as described above, the signal on the send/output data update identification line 20 is inverted via the data bus 15 and set to 0 level.

The MPU 4 detects the inversion in the same manner as described above, and reads in parallel the data shown at the opening in FIG. 3(C) written in the data output port 10 in the same manner as described above.

That is, each time the data is updated, the signal on the sending data update identification line 20 is inverted as shown in FIG. 3(B) to notify that the data has been updated.

The above operation continues until the last data to be sent. When there is no more data to send, as in the conventional case, the MPU 3 uses the address decoder 5 to instruct the port 9 for identifying the sending data, and uses a signal from the data bus 15 to change the state identification signal line 17 as shown in FIG. 3(A). (Set as 0 level.

Since the MPU 4 periodically instructs the received data identification port 1-11 with the address decoder 7 and monitors the state of the state identification signal line 17 via this, it knows that it has become 0 level. Recognize that data transfer is complete.

Therefore, in this method, each time the sending data is updated,
Rather than indicating the order of data, data updates are identified by inverting the polarity of the signal.
Only one transmission data update identification line 20 is required regardless of the number of data, and a corresponding transmission data identification port 1-9a is required.
and the received data identification boat l'la may each be of one block, and the microcomputer 1a2a
Even if the number of sending data to be exchanged between them is different, the sending data identification port 9a and the receiving data identification port 10a
can be made common on a small scale and have a certain configuration.

(90 Effects of the Invention As explained in detail above, according to the present invention, even if the number of sending data to be exchanged between two systems of microcomputers is different, the sending data identification port and the receiving data identification port can be configured on a small scale. It has the effect of being able to be standardized in a certain configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a time chart of waveforms of various parts in FIG. 1 in the figure. la, 2, 2a is micro conference evening, 3,
4 is a microprocessor, 5 to 8 are address decoders,
9, 9a are sending data identification ports; 10 is a data output port; 11. lla is a port for identifying received data, 1
2 is a data input port, 13.14 is an address bus,
15.16 is a data bus, 17 is a status identification signal line, 18
19 represents a data order identification signal line, 19 represents a data output line, and 20 represents a transmission data update identification line. Mouth jr -11-----3 eyes

Claims (1)

[Claims] When data is exchanged continuously in real time between two systems of microcomputers in one device, the sending data identification boat of the sending system and the receiving data identification boat of the receiving system are used to determine whether the sending data is being sent or not. A data exchange system characterized in that it uses two signal lines: a state identification signal line indicating whether or not to send data, and a transmission data update identification line whose polarity is inverted every time transmission data is updated.