【正文】 s basketball. Until World War II, basketball became increasingly popular in the United States especially at the high school and college levels. After World War II, its popularity 29 grew around the world. In the 1980s, interest in the game truly exploded because of television exposure. Broadcast of the NCAA Championship Games began in 1963, and, by the 1980s, cable television was carrying regular season college games and even high school championships in some states. 。 and Japan in 1900. From 1891 through 1893, a soccer ball was used to play basketball. The first basketball was manufactured in 1894. It was 32 in (81 cm) in circumference, or about 4 in (10 cm) larger than a soccer ball. The dedicated basketball was made of laced leather and weighed less than 20 oz (567 g). The first molded ball that eliminated the need for laces was introduced in 1948。 England in 1894。 smaller gyms used five players on a side, and the larger gyms allowed seven to nine. The team size became generally established as five in 1895, and, in 1897, this was made formal in the rules. The YMCA lost interest in supporting the game because 1020 basketball players monopolized a gymnasium previously used by many more in a variety of activities. YMCA membership dropped, and basketball enthusiasts played in local halls. This led to the building of basketball gymnasiums at schools and colleges and also to the formation of professional leagues. Although basketball was born in the United States, five of Naismith39。s five basic principles center on the ball, which was described as large, light, and handled with the hands. Players could not move the ball by running alone, and none of the players was restricted against handling the ball. The playing area was also open to all players, but there was to be no physical contact between players。s bounce. Inside the covering or casing, a rubber bladder holds air. The ball must be inflated to a pressure sufficient to make it rebound to a height (measured to the top of the ball) of 4954 in ( m) when it is dropped on a solid wooden floor from a starting height of 6 ft ( m) measured from the bottom of the ball. The factory must test the balls, and the air pressure that makes the ball legal in keeping with the bounce test is stamped on the ball. During the intensity of high school and college tourneys and the professional playoffs, this inflated sphere mands considerable attention. Basketball is one of few sports with a known date of birth. On December 1, 1891, in Springfield, Massachusetts, James Naismith hung two halfbushel peach baskets at the opposite ends of a gymnasium and outlined 13 rules based on five principles to his students at the International Training School of the Young Men39。s games measures in (7576 cm) in circumference, and a women39。s disorder (a related condition in which the baby develops in an apparently normal manner through age five months, and then begins to lose municative and social interaction skills). There is also evidence of a higher proportion of perinatal plications (plications arising around the time of giving birth) among children with autistic symptoms. These plications include maternal bleeding after the first trimester and meconium in the amniotic fluid. (Meconium is a substance that accumulates in the bowel of the developing fetus and is discharged shortly after birth.) Some evidence suggests that the use of medications during pregnancy may be related to the development of autistic symptoms. As newborns, children with autistic behaviors show a higher rate of respiratory illness and anemia than healthy children. ALLERGIES, INFECTIONS, AND IMMUNIZATIONS. Some professionals believe that autistic disorders may be caused by allergies to particular fungi, viral infections, and various foods. No controlled studies have supported these beliefs, but some parents and professionals report improvement when allergens and/or certain foods are eliminated from the diet. Viral infections of the mother, such as rubella, or of the young child, such as encephalitis, mumps, and measles, occasionally appear to cause autistic disorders. The mon childhood immunization series known as MMR (measles, mumps, rubella) has recently e under scrutiny as a possible cause of some autistic can make a true claim to being the only major sport that is an American invention. From high school to the professional level, basketball attracts a large following for live games as well as television coverage of events like the National Collegiate Athletic Association (NCAA) annual tournament and the National Basketball Association (NBA) and Women39。 17 參 考 文 獻(xiàn) [1] 韓成 .《單片機(jī)技術(shù)與應(yīng)用》 電子工業(yè)出版社 [2] 胡漢才 . 《 單片機(jī)原理與接口技術(shù) 》 . 北京 :清華大學(xué)出版社 [3] 董孝昌 . 《 單片機(jī)原理與應(yīng)用 》 . 大連 :東北財(cái)經(jīng)大學(xué)出版社 [4] 何立民 . 《 單片機(jī)高級(jí)教程 》 . 北京 :航空航天大學(xué)出版社 [5] 楊寧 ,胡學(xué)軍 . 《 單片機(jī)控制步進(jìn)電機(jī)系統(tǒng)設(shè)計(jì) 》 . 安徽技術(shù)師范學(xué)院學(xué)報(bào) [6] 耿長青主編 . 《 單片機(jī)應(yīng)用技術(shù) 》 . 北京： 北京化學(xué)工業(yè)出版社 [7] 李全力主編 . 《 單片機(jī)原理及應(yīng)用技術(shù) 》 . 北京 :高等教育出版社 [8] 張有德 . 《 單片微機(jī)原理、應(yīng)用與實(shí)驗(yàn) 》 . 上海 :復(fù)旦大學(xué)出版社 [9] 何利民 . 《 單片機(jī)高級(jí)教程 》 . 北京：北京航空航天大學(xué)出版社 18 附 錄 附錄 1 初始化程序 ： SETUP: MOV 20H， 00H CLR A MOV R0， 30H MOV R7， 32 LP0: MOV R0， A DJNZ R7， LP0 MOV P1， 0FFH MOV P2， 0FFH MOV P3， 0FFH MOV SP， 70H MOV IE， 8FH； MOV IP， 0DH SETB IT0；下降沿觸發(fā) CLR IT1；低電平觸發(fā) MOV TMOD， 21H MOV TH0， 3CH MOV TL0， 0B0H MOV TH1，