Serial port extender for microprocessor
A microprocessor and serial port expansion technology, which is applied in the field of serial port expanders, can solve the problems of not being able to control one-to-one, being expensive, and not providing a chip selection signal for the microprocessor, and achieving the effect of convenient control and low price
Inactive Publication Date: 2014-06-18
佛山市顺德区航旭电子科技有限公司
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Problems solved by technology
There are two main disadvantages in the existing expansion equipment: one is that the price is relatively expensive; the other is that there is no chip selection signal for the microprocessor to control, that is, it is generally in the form of one-to-many, and cannot be controlled one-to-one.
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[0012] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.
[0013] In the description of the present invention, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.
[0014] Such as figure 1 As shown, it is a serial port expander for a microprocessor, including a serial port signal expansion module 11, a level conversion module 12 and first to fourth serial port interfaces 13, 14, 15, 16; wherein the level The input ...
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The invention relates to a serial port extender for a microprocessor. The serial port extender for the microprocessor is characterized in that the serial port extender comprises a serial port signal extension module, a level conversion module, a first serial port interface, a second serial port interface, a third serial port interface and a fourth serial port interface, wherein an input end of the level conversion module is electrically connected with an output end of the serial port signal extension module, the first serial port interface, the second serial port interface, the third serial port interface and the fourth serial port interface are respectively and electrically connected with four output ends of the level conversion module, a TTL (Transistor-Transistor-Logic) input end of the serial port signal extension module is electrically connected with a TTL level serial port of the microprocessor, and two chip selection input ends of the serial port signal extension module are respectively and electrically connected with two chip selection signal serial ports of the microprocessor. The serial port extender for the microprocessor has the advantages that the price is very cheap, the control by the microprocessor is facilitated by providing serial port chip selection signals, and the handshake connection of software or hardware is not required during use.
Description
technical field [0001] The invention relates to the technical field of electronic information, in particular to a serial port expander for a microprocessor. Background technique [0002] Regardless of whether it is an 8-bit, 16-bit or 32-bit microprocessor, generally there are only 1-2 independent serial communication interface modules inside; in some applications, there are multiple devices that need to use serial ports for communication. [0003] At this time, it is necessary to expand the number of existing serial ports. There are two main disadvantages in the existing expansion equipment: one is that the price is relatively expensive; the other is that there is no chip selection signal for the microprocessor to control, that is, it is generally in the form of one-to-many, and cannot be controlled one-to-one. Contents of the invention [0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a kind of very cheap price, a...
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Inventor 蔡泽凡周虹杨小东牛俊英
Owner 佛山市顺德区航旭电子科技有限公司