Universal asynchronous serial extended chip of multi-bus interface

Abstract

The utility model discloses a multi-bus interface extended chip with general asynchronous serial ports, comprising a host interface, a subchannel processing module, a MODEM control logic module, an interrupt control logic module and a clock generator. The utility model is characterized in that the host interface comprises a 8-bit parallel bus interface, a serial peripheral interface SPI bus interface, a UART bus interface, an internal integrated circuit bus I2C bus interface, a protocol processor, a global register and a mode selection control logic module, wherein the four bus interfaces are all connected with the CPU / DSP host and the bus type corresponding the host is selected through the bus processing logic, in addition, the data and the conversion of data format are processed through the bus processing logic. The working state of the host interface of the chip is setup by the global register and the mode selection, the mode selection control logic module selects the host interface and the signal line through mode. The utility model supports 8-bit parallel bus, SPI bus, I2C, UART and other host bus interfaces, realizes a plurality of extended serial ports for buses, besides, the utility model has compact and perfect configuration register structure and enables multi-working modes set of the sub serial ports independently, and supports high-speed communication, and each channel has independent and controllable data broadcasting and receiving function, and all UARTs support IRDA infrared communication.

Description

Technical field [0001] The invention relates to a UART universal asynchronous serial port expansion integrated circuit chip, in particular to a universal asynchronous serial port expansion chip with a multi-bus host interface, the sub-channels can be independently set, and a built-in multi-bus protocol processor and a simplified register structure. Background technique [0002] The Universal Asynchronous Receiver / Transmitter (Universal Asynchronous Receiver / Transmitter) was born in the 1970s and is currently widely used in computers, communications, industrial control, household appliances, consumer electronics and other fields. UART is the first large-scale integrated circuit. UART has been produced a few years before the appearance of monolithic microprocessor. Compared with 30 years ago, the structure of current UART is basically similar. [0003] As a universal serial data bus, UART is mainly used for asynchronous communication. This bus has two-way communication and can real...

AI Technical Summary

Problems solved by technology

[0005] Up to now, there are more than 40 kinds of UART devices to choose from around the world, but because multiple UARTs work at the same time involves relatively complicated internal timing and cooperative work processing, the current UARTs are still very versatile, pins, and registers until today. There are few changes, and there are only a handful of UART extensions that can truly achieve full functions

Most UART devices are based on the computer bus conversion UART, which generally has the disadvantages of complex operation, many pins, and high cost.

[0006] In embedded applications, the microprocessor controller MCU and peripherals basically use serial ports for communication, and most microprocessor controllers MCU only have one serial port. Traditional serial port expansion ICs generally need to occupy a large number of IOs of the MCU. Suitable for use in embedded systems

Now, more software is used to simulate the serial port, which has the disadvantages of occupying MCU resources, slow communication speed, and unreliable communication.

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