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设外部有一脉冲信号源PLUS，要求用8253—5的计数器0对该信号源连续计数，当计数器计为0时向CPU发出中断请求。

1、画出8253-5的CLK0、GATE0和OUT0的信号连接图。

2、若该芯片的端口地址为40H～43H，计数初值为1234H，写出该计数器工作在方式2按二进制计数的初始化程序。

3、若计数初值为12345H，在上述基础上增加计数器1如何连接以实现计数。

答案

参考答案：

1.

2.

3.PLUS作CLK0的输入，OUT0的输出作CLK1的输入信号。OUT1的输出作CPU的请求信号。用两个计数器串联计数实现20位二进制的计数。

问答题

某企业2009年度有关资料如下：
(1)与机械厂签订设备安装合同一份，合同注明设备价款500万，按设备价款的5%支付安装费用；
(2)与某专业银行签订贴息贷款合同一份，注明借款5000万元，60%的利息由财政负担；与某财务公司签订贷款合同，注明借款6000万元，利率5%；
(3)当年1月，融资成功，实收资本比上年增加2000万元；当年新设其他账簿10本；
(4)与某物流公司签订保管合同，合同注明保管存货的金额11300万元，按存货的5%收取保管费；
(5)与某技术开发企业签订合同，委托其开发某产品技术，技术成功后双方共有，约定该单位提供专项资金1000万元用于购买研发设备和专业耗材，支付开发企业的报酬为280万元。
要求：根据上述资料，按下列序号计算回答问题，每问需计算出合计数(以元为单位)：
1.计算该企业安装设备合同应缴纳的印花税；
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阅读理解

Fucheng Garden Villas is situated along the North 4 th Ring Road , just 2 kilometres east away from the Asian Games Village with easy traffic connection. It is 5 kilometres from the Beijing Lufthansa Centre.

Fucheng Garden Villas occupies an area of 34.7 hectares, over 80% of which is covered by trees and green, just like a garden in the city.

All the 108 villas were designed by American Company IDI, in American style, luxurious besides comfortable.

All materials of the construction and decoration as well as equipment are famous American products.

From now to July 31st, preferential（优惠）prices for sale and rent are offered. You can move into Fucheng Garden Villas on signing an agreement.

Bank will provide a 50％ mortgage（抵押）for 5 years.

Overseas sales License: NO. 124.

Developer: Beijing Hongda Read Estate Co. Ltd.

60East, North 4th Ring Road, Chaoyang District, Beijing.

Tel:（8610）64967050  64967049

Fax:（8610）64933575

（From Wednesday, June 25, 1997 CHINA DAILY）

小题1:The advertiser is _________.

A．Fucheng Garden Villas

B．American Company--IDI

C．Beijing Hongda Road Estate Co. Lid

D．The Beijing Luftthansa小题2:How many hectares is Fucheng Garden Villas covered by trees and greens?

A．6.94

B．More than 27.76

C．27.76

D．80%小题3:According to the advertisement, which of the following statements is NOT true?                                

A．From June 25 to July 31, 1997, you can buy or rent the Fucheng Garden Villas with a low price.

B．You can’t move into Fucheng Garden Villas before signing agreement

C．If you haven’t got enough money at the moment, you can’t buy the Villas

D．Not only equipment but also all materials of the construction and the decoration are made in America
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