1、2000 单词， 1 万英文字符， 3000 汉字 High performance eight monolithic integrated circuits AT89C51 Abstract Introduced by the Beijing integrated circuit design center design, US produce high performance eight monolithic integrated circuits AT89C51 characteristic, structure and operation application method. Key
2、 word： high performance chip encryption operation application 1 Characteristic AT89C51 and the MCS251 series monolithic integrated circuit is completely compatible on the command system and the pin 2 Internal on-line has the 4k byte to be possible to duplicate programs scratches quickly writes the p
3、rogram memory 3 Entire static work, Operating region: 0Hz 24MHz; 4 Three levels of program memories encryption; 5 1288 position interior RAM; 6 32 bidirectional inputs output lines; 7 Two 16 timers counters; 8 Five interrupt sources, Two levels of severances priorities; 9 An entire duplex asynchrono
4、us serial mouth; 10 The intermittence and falls the electricity work way. 二 Functional description Base pin explanation that, VCC: Power line voltage. GND: Earth. P0 mouth: The P0 mouth is 8 leaks the level to lead the way bidirectional I/O， each foot may absorb the 8TTL gate electric current. When
5、the P1 mouth base pin first time writes 1, is defined inputs for High performance resistance. P0 can use in exterior procedure data-carrier storage, it may define as the data/O, the P1 mouth buffer can receive outputs the 4TTL gate electric current. After the P1 mouth base pin reads in 1, is pulled
6、by the interior in for is high, may serve as the input, the P1 mouth when under is pulled by exterior for the low level, output current, this is because in the interior pulls reason. When FLASH programming and verification, P1 mouth achievement eighth bit address receive. P2 mouth: The P2 mouth is in an interior pulls the resistance 8 bidirectional I/O, the P2 mouth buffer may receive, outputs 4 TTL gate electric current, when the P2 mouth is written 1, its base pin is pull
