外文翻譯--關(guān)于pc機(jī)與單片機(jī)串行通信設(shè)計(jì)的實(shí)現(xiàn)-全文預(yù)覽
【正文】 = 1200 b/S = 1200 baud. Each transmission time for the reciprocal of baud rate: Td = 1/1200 = ms Asynchronous munication is according to the characters of the transmission and receiving equipment as long as after receiving a start signal in a transmission time internal energy of the characters and send equipment in sync can be received correctly. The arrival of the next character start bit make synchronization and recalibrate. System works in MSC 51 microcontroller serial port to send/receive data, through the two serial buffer SBUF, automatically send characters at the end of the beginning, by the hardware (low level) bined with a start bit and stop bit (electronic) and other control bits, such as the parity bit, etc.), and then under the control of the mobile pulse, low before, and in the high bit by bit from the TXD except way (0). In the process of accepting, serial port to receive or not under the control of the state of permitted to accept a REN, when REN is the software after the 1, allows the receiver to receive. Serial receiver to 16 times the speed of the selected baud rate to monitor RXD line. When 1 to 0 jump, detector sampling to RXD line low electricity at ordinary times in A row, then decided that there have start bit RXD, then receive the controller starts to work, in each transmission time 7, 8, 9 three pulse 6 sampling RXD state line, decided the received value of 0 or 1. When after receiving the stop bit, charge circuit using interrupt flag R1 1, the program can be MOV A, SBUF order will receive characters from SUBF into the accumulator A, to plete A frame data receiving work. In the design, the function of the system consists of two parts of hardware and software coordinated, the hardware part mainly plete information display。 controller Controller is the mand center of the puter, is used to control, accused the entire puter system automatically, continuously running and coordinated work between the parts. 2 Single chip microputer hereinafter referred to as single chip microputer, it is the central processing unit (CPU), memory (RAM and ROM), timer/counter, and all sorts of interface circuits are integrated into a integrated circuit chip microputer. With the development of puter technology, especially the single chip microputer technology, people have increasingly e to some industrial control system by single chip microputer testing and control parameters such as temperature and humidity. PC machine has powerful monitoring and management functions, while MCU have the characteristics of fast and flexible control, through the PC RS 232 serial interface to municate with external devices, is a kind of munication that is monly used in many measurement and control system solutions. So how to realize the munication between PC and single chip microputer has very important practical significance. For some remote control or risk is higher, the application of the data acquisition and control, this paper mainly introduces a way of using duplex implementation of serial munication between PC and single chip microputer. Serial munication refers to the peripherals and puter use a data line between a a transmission of data, each data occupy a fixed length of time. Serial refers to the way of information transmission b
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