【正文】 tput, at the same time only one output. The TV sets of this case is selected, the other is like the light and sound input speed, etc. Data refers to launch the output some key, use a few output form a binary number, to represent different keystroke. Normally, the receiver except a few data output, but also a valid output data, so the timely to collect data. This output form with singlechip microputer or are monly used interface. In addition to the above output form outside, still have a latch and temporary two forms. The socalled latch refers to launch the output signal of each hair, the receiver output corresponding , new store until you receive signals. Temporary output and the introduction of level output is similar. Remote distance (Remote Control effect of RF Remote Control distance) are the major factors as follows: 1, launched in power transmission power: while distance, but great power consumption, easy to generate interference, 2 and receiving the receiver sensitivity, receiving, remote distance increased sensitivity to improve, but easy to cause disturbance maloperation or abuse, 3, antenna, using linear antenna, and parallel, remote distance, but occupies a large space, in use the antenna spin, pull can increase the remote distance, 4 and the higher height: antenna, remote farther, but by objective conditions, 5 and stop: current use of wireless remote use of UHF band stipulated by the state, the propagation characteristics of approximate linear transmission, light, small, transmitters and receivers diffraction between such as walls are blocking will greatly discounted remote distance, if is reinforced concrete walls, due to the absorption effect conductor, radio waves. Considering the design of hardware volume small to be embedded in the remote control, so we chose 20 foot singlechip chip AT89C2051. Below is the introduction of the function. 1) AT89C2051 internal structure and performance AT89C2051 is a byte flash 2K with programmable readonly memory can be erased EEPROM (low voltage, high performance of eight CMOS microputer. It adopts ATMEL of highdensity nonvolatile storage technology manufacturing and industrial standard MCS 51 instruction set and lead. Through the bination of single chip in general CPL1 and flash memory, is a strong ATMEL AT89C2051 microputer, its application in many embedded control provides a highly flexible and low cost solutions. The patible with 8051 AT89C2051 is CHMOS micro controller, the Flash memory capacity for 2KB. And CHMOS 80C51 process, have two kinds of leisure and power saving operation mode. The performance is as follows: 8 CUP, 2KB Flash memory, Working voltage range , 128KB data storage, The static working way: 024MHz, 15 root input/output line, A programmable serial, 2 a 16bit timing/counters, There is a slice of inside precision simulation parator, 5 the interrupt sources, 2 priority. Programmable serial UART channel, Directly LED driver output, The internal structure of AT89C2051 is shown in figure 1. Figure 1 AT89C2051 interior structure 2) AT89C2051 chip pin and function In order to adapt to the requirement of intelligent instrument, embedded in the chip foot AT89C2051 simplified configuration, as shown in figure b. The major changes to: (1) the lead foot from 20 to 40 wires, (2) increased a simulated parator. Diagram b AT89C2051 foot figure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 89C2051 RST/VPP (RXD) (TXD) XTAL2 XTAL1 (INT0) (INT1) (T0) (T1) GND VCC (AIN1) (AIN0) AT89C2051 pin function: 1 the Vcc: voltage. 2: to GND. 3 P1 mouth: P1 mouth is an 8bit twoway I/O port. ~ mouth pin the internal resistance provides. and requirements on the external pullup resistors. and also separately as piece inside precision simulation parator with input (AIN0) and reversedphase input (AIN1). Output buffer can absorb the P1 mouth 20mA current and can directly LED display driver. When P1 mouth pin into a 1, can make its input. When the pin ~ as input and external down, they will be for the internal resistance and flow current (IIL). In flash P1 mouth during the procedure and program code data receiving calibration. 4 P3: the ~ P3, is the internal resistance with seven twoway I / 0 lead. for fixed inputs piece inside the