XR82C684CJ/44-F

The XR82C684CJ/44-F is a Universal Asynchronous Receiver Transmitter (UART) used for communication between asynchronous serial links. It is a UART integrated circuit IC from the Intel 8051 family of microcontrollers and is used mainly in embedded applications such as in modems, printers, and other serial devices. This article will look at the XR82C684CJ/44-F\'s application field and working principle.

Application field of the XR82C684CJ/44-F

The XR82C684CJ/44-F is primarily used in embedded systems, providing access to the 8051 microcontroller. The chip is designed to operate with its external 16-bit address bus and data bus, allowing it to interface with a variety of peripherals in order to drive serial communication. It supports a number of UART protocols such as RS-232, RS-422, and RS-485, as well as other standard protocols including Modbus and HDLC.

In addition to providing access to serial devices, the XR82C684CJ/44-F is also used to provide communications between the microcontroller and external memory devices, such as SRAM, EPROM, and EEPROM. This allows the microcontroller to access the external memory devices, enabling it to store and retrieve data. This is useful in applications where data needs to be stored over a long period of time, such as in modems and printers.

The XR82C684CJ/44-F is used in a wide variety of embedded applications. It can be used in automotive systems, security systems, home automation systems, industrial automation systems, and many other types of applications. In each case, the chip is used to provide serial communication between devices, allowing for efficient and reliable data transfer.

Working principle of the XR82C684CJ/44-F

In order to understand the working principle of the XR82C684CJ/44-F, it is necessary to understand the basics of UARTs. UARTs are designed to interface with a variety of asynchronous serial links, providing a means of communication between two devices. The communication is achieved by first transmitting a start bit, followed by a series of data bits, an optional parity bit, and a stop bit. The start, parity, and stop bits are used to control the data flow, while the data bits are used to contain the data being sent across the link.

The XR82C684CJ/44-F is designed to send and receive data on a serial link. The chip is connected to the 8051 microcontroller via the external 16-bit data bus. The chip also has a separate data bus for receiving and transmitting data, enabling the microcontroller to communicate with external devices. The chip can operate in a variety of modes, including asynchronous, half-duplex, and full-duplex.

When using the chip in asynchronous mode, the start bit is transmitted first to control the flow of data. The chip then waits for the next byte to be received. Once the byte has been received, it is transmitted out over the transmit line and the chip then waits for the next byte to be received. This process is repeated until all data has been sent or received. If the chip is operating in half-duplex mode, only one device is allowed to transmit at any given time.

When using the chip in full-duplex mode, both devices can transmit and receive data at the same time. The chip is designed to operate at RS-232 speeds, although it can also be configured to operate at different speeds, such as RS-422 or RS-485. The chip also supports a variety of modulation schemes, enabling it to communicate over different types of networks.

The XR82C684CJ/44-F is a versatile UART IC, providing a low-cost solution for interfacing with a variety of serial links. The chip is designed to operate with the 8051 family of microcontrollers, providing a means of communication between the microcontroller and external peripherals. The chip can operate in a variety of modes, including asynchronous, half-duplex, and full-duplex, enabling it to be used in a variety of applications.