JPS60249449A - Semiconductor device - Google Patents

Abstract

PURPOSE:To transmit and receive data of two systems independently of each other and to transmit and receive data of a multibit length by providing two systems of communication means which can transmit and receive individual bits of data in serial, and connecting communication means in series on demand. CONSTITUTION:In the normal operation, serial data inputted to an input terminal 11 is converted to parallel data by the first communicating means 10 having transmission and reception functions and is sent to a processor 8. Data from the processor 8 is converted to serial data by the first communicating means 10 and is outputted from an output terminal 12. The second communicating means 13 is constituted similarly to the means 10 and transmits and receives data independently. When long bit data is transmitted and received, the output of the means 10 and the input of the means 13 are connected, and long bit serial data from the input terminal 11 is supplied to the processor as parallel data from means 10 and 13. Data from the processor 8 is converted to serial data by means 10 and 11 and is outputted from an output terminal 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides data of two independent digital signals.
The present invention relates to a semiconductor device that can serially transmit and receive bits at the same time.

Conventional configurations and their problems In recent years, semiconductor devices such as microprocessors have been increasingly applied to electronic devices because they have excellent control capabilities. As control becomes more complex, it has become necessary to serially transmit and receive digital signal data to and from other electronic devices. This is because serial transmission and reception of data is useful for reducing wiring in electronic devices. Conventional semiconductor devices such as microprocessors have only one system of communication means for serially transmitting and receiving such data bit by bit.

FIG. 1 is a block diagram showing one embodiment of a conventional semiconductor device. 1 is a semiconductor device that integrates a microprocessor, etc.; 2 is a microprocessor body; 3 is a data bus; 4 is a communication means for transmitting and receiving data serially; 6 is a serial data input terminal; 6 is a serial data input terminal; To briefly explain the operation, in the case of reception, serial data is input to the communication means 4 from the input terminal 6, and the microprocessor body 2 receives and processes the data via the data bus 3.In the case of transmission loads the data of the microprocessor main body 2 into the communication means 4 via the data bus 3, and sends it out from the output terminal 6 as serial data.

However, the above configuration has the problem that the electronic devices to which data is sent and received are independent (if there are two systems, simultaneous transmission and reception is impossible, and as a result, the overall control ability is reduced). OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a semiconductor device having two independent systems of communication means for serially transmitting and receiving data bit by bit, and which can also be connected in cascade. The purpose is to provide.

Structure of the Invention The present invention provides a first communication means capable of serially transmitting and receiving digital signal data bit by bit, and a first communication means capable of serially transmitting and receiving digital signal data bit by bit independently of the first communication means. a possible second means of communication;
A semiconductor device is provided with a connecting means for cascading the output of the first communication means to the input of the second communication means. It is capable of simultaneously transmitting and receiving real data and transmitting and receiving multi-bit serial data.

Description of examples FIG. 2 is a block diagram showing one embodiment of the present invention.

In FIG. 2, numeral 7 denotes a semiconductor device integrally formed with a microprocessor, an 8-digit microprocessor body, 9
is a data bus, a first communication means for serially transmitting and receiving 10 digits, an input terminal for 11 digit serial data, 12
13 is a second communication means for serially transmitting and receiving data, 14 is an input terminal for serial data, 15 is an output terminal for serial data, 16 is an output of the communication means 1o, 17 is a communication means 1o and communication means 13
This is a connecting means for cascading.

The operation of the semiconductor device of this embodiment constructed as described above will be explained below based on the block diagram of FIG. 2.

First, when processing data from two independent VC systems, the coupling means 17 selects the signal from the input terminal 14. The received serial data is inputted to the multi-communication means 10vC through the input terminal 11, and is processed by the microprocessor body 8 via the data node 9. The data to be transmitted from the microprocessor body 8 is loaded into the communication means 1° via the data bus 9, and sent out from the output terminal 12 as serial data.

Similarly, the other received serial data is input to the communication means 13 from the input terminal 14 via the connection means 17 and is processed by the microprocessor body 8 via the data bus 9. The data to be transmitted from the microprocessor body 8 is loaded into the communication means 13 via the data bus 9, and sent out from the output terminal 16 as serial data.

The bit processing unit of communication means 10 and communication means 13 is usually 8.
It is a bit, but any number of bits is acceptable.

When processing multi-bit data, the first communication means 10 and the second communication means 13 are connected in cascade by the connection means 17. The connecting means 17 connects the output 16 of the communication means 1o.
is selected as an input to the communication means 13.

As a result, the communication means 1o and the communication means 13 together receive the multi-bit serial data from the input terminal 11, and the data bus 9. Microprocessor body through AV
C data can be passed. On the contrary, the multi-bit data of the microprocessor main body 8 is loaded into the communication means 1o and the communication means 13 via the data bus 9, and is transmitted from the output terminal 15 as multi-bit serial data. According to , it is possible to simultaneously process the transmission and reception of two systems of 7-real data and to process the transmission and reception of multi-bit and long serial data, so the serial data processing ability has been greatly improved compared to the past. Therefore, this semiconductor device greatly contributes to reducing the wiring required for data transmission and reception of digital signals in the control of electronic equipment. By providing independent means, it is possible to simultaneously transmit and receive serial data between two different types of electronic devices, and furthermore, by connecting the first communication means and the second communication means, multi-bit Since long serial data can also be transmitted and received, it is possible to realize an excellent semiconductor device that can significantly reduce the wiring required for data transmission and reception of digital signals in controlling electronic equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a conventional semiconductor device, and FIG. 2 is a block diagram showing an embodiment of the semiconductor device of the present invention. DESCRIPTION OF SYMBOLS 1... Semiconductor device, 2... Microprocessor body, 3... Data bus, 4... Communication means, 5... Input terminal, 6... ...Output terminal, 7...Semiconductor device, 8...Microprocessor body, 9...Data bus, 1o...First
communication means, 11...input terminal, 12...
Output terminal, 13...Second communication means, 14...
・Input terminal, 16... Output terminal, 16...
... Output of second communication means, 17... Connection means.

Claims (1)

[Claims] a first communication means capable of serially transmitting and receiving data of a digital signal bit by bit, and a second communication means capable of serially transmitting and receiving data of a digital signal bit by bit independently of said first communication means; A semiconductor device comprising: communication means; and connection means for cascading and reading the output of the first communication means to the input of the second communication means.