Improvement of "Manual Programming of 89C2051"
1The application of thermal ceramic heating element in the automobile â–¡ Sun North positive temperature coefficient heating element, has the advantages of no open flame heating, fast self-control and constant temperature life. The constant temperature electric iron is the typical one, and the original meaning is introduced. The heating element is used as a ceramic heater for low temperature start-up of the vehicle in the automotive oil circuit. There is a branch type flat disc type and a ring type structure. Its co-question feature is that the thermal efficiency island is small in size and simple in structure. 1 is fixed on the wall of the gasification chamber to heat the gasification chamber. The temperature is rapidly increased to increase the gasification efficiency of the fuel. This will not only help the car start at low temperature, but also reduce waste 1 pollution. It will also reduce fuel consumption. Because the factory thermistor has a self-controlled constant temperature heating characteristics. Therefore, it is very suitable for the car with changing working environment. 1 The performance parameters of the low temperature starter ceramic heater are as follows. The kit is available for the above products. Luoyang Xialin Electronic Appliance Factory has long been available for each model. With the installation position of the manual, the big car uses 68 yuan each, and the car uses 55 yuan each. More discounts in bulk. Zip code 471003; telephone transmission of the manual editing of 82, 51 in the single-chip field 0, in the text, there is a mistake in the design circuit that automatically switches the programming voltage according to the programming mode. The original circuit 9013 is the driver of the servant. When the level is high, the voltage on the emitter of the D1 can only be 5 or so. According to the original design circuit, only the 3 feet of 89, 2051 are always getting 12 voltages. If the circuit assembly is designed according to the original text, it is practically impossible to erase or write the program memory in the 20.51.
The correct design is attached here. The part inside the dotted line box. In place of the original Ding 1 part of this hole hand programming dream improvement when the sink 4 is high level, the middle 9012 can be fully turned on, the ruler 3 can only get 12 voltage, to achieve the erase or write function.
Making a talk about 8 terminals â–¡ Su Chengfu more and more large screen color TV has a 5 door, commonly known as 3 terminal 3 terminal 3 is the English 3 å© prefix, translated as é‚ grade, in other words. It refers to the interface of high-definition video signals; most of the ordinary color TVs have terminals, which are used for directly receiving the processed video signals for the color TV playback image, and the video terminal status of the input color TV is switched by the input and output. The chrominance circuit and the brightness circuit are divided, processed, and then sent to the matrix circuit to form a primary color video signal by decoding. Finally, the 8-channel video amplification output is used to modulate the primary color electron beam of the picture tube to reproduce the color image. The video signal of the VCR is transmitted through the above complicated transmission, and the distortion is very large, and only the resolution of about 2,0300 lines can be obtained.
The video signal transmitted by the 8-terminal can eliminate the mixed coding synthesis of the medium luminance signal and the chrominance signal and the input switching in the television. The steps of matrix decoding and the like greatly reduce the signal distortion during transmission. The method adopted is to separate the luminance signal and the chrominance signal by the video signal through the comb filter, and separately process and output the respective ç–‹ circuits. Avoid crosstalk between signals and signals caused by the video signal interface. Maximize the purity of the signal = then send straight 3, such as the interface. Through the 3-terminal line, the 7 0 signal is input to the 5,1 of the large-screen color TV, and the interface is sent to the ç–‹ circuit to process the synthesized primary color video signal through the signal selection. Finally, only the 8 video amplification output is used to modulate the basic color electronic production of the picture tube.
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