1、 1 附录 C：外文资料翻译 Uses the multi-monolithic integrated circuits fluid position monitoring meter Uses the monolithic integrated circuit design fluid position monitoring meter is the very general procedure. If must survey the fluid position has many groups (above 16 groups), each group request can roll d
2、emonstrates in 1 year each class, every day, each months input output total quantity (on 1st 3 classes), normal or the accident power cut data does not lose, man-machine interaction ability striving to excel (must establish suitable quantity pressed key and uses the LCD demonstration), and each Lu Y
3、ewei requests to correspond 2 group control output signal (fluid pot liquid input control and output control), the disposition miniature printer port, the establishment sound warning, all these need many I/O ports to support without doubt, the only monolithic integrated circuit is cannot accomplish,
4、 needs to expand the I/O port. In this design, the author thought that uses the special-purpose I/O expansion chip to have many malpractices, weighed the advantages and disadvantages, chooses has replaced special-purpose I/O with the monolithic integrated circuit the connection chip the method. spec
5、ial-purpose I/O chip and the monolithic integrated circuit serve as the I/O chip the contrast: Special-purpose I/O connection chips I/O mouth quantity are not more than the monolithic integrated circuit (the author to use monolithic integrated circuit model is 89C52). The special-purpose I/O connect
6、ion chip use is not flexible, several use ways have been established by the chip designer, cannot surpass this scope change, but the monolithic integrated circuit receives limits is small, uses nimbly. The special-purpose I/O connection chip independence is bad, intelligence difference, regardless o
7、f being receives the input signal or the output control signal, the I/O special-purpose chip adds color to the signal input output cannot make the decision, must by the monolithic integrated circuit decision making, only play relay or the transition signal role, has not monitored ability, cannot the
8、 independent processing question, but the monolithic integrated circuit is not so, may use many kinds of way nimble processing question. 2 Uses I/O to expand the special-purpose chip to probably be familiar with it, the engineers and technicians must be more than generally to monolithic integrated c
9、ircuits familiar degree to it, comparatively, uses it to waste the time, another I/O expands the special-purpose chip the price to be higher than the monolithic integrated circuit, considers from the cost accounting not economically. Special-purpose I/O chip timeliness is bad, because I/O expands th
10、e special-purpose chip only to play the receiving and dispatching signal the role, itself has not processed the processing signal ability, such signal will undergo its transmission back and forth to create the detention inevitably, will thus have the timely bad problem. Uses the monolithic integrate
11、d circuit to make the I/O connection, is advantageous for the software and hardware design modulation, the division of labor is clear, for the design, the debugging, the maintenance brings enormously convenient. Used the monolithic integrated circuit to make the I/O connection to strengthen for the
12、connection supervision dynamics, lightened the main monolithic integrated circuits burden. Hardware architecture and division of labor: The hardware design is divided the following several parts: Monolithic integrated circuit； A/D conversion fraction； Control signal output unit； The nonvolatile stor
13、age (makes the RAM expansion)； Presses a key the part； Demonstrates the part； Prints the I/O port part； Analog switch part. The monolithic integrated circuit selects 89C52, its characteristic is internal includes 8KB ROM, does not need outside the piece to expand ROM； A/D switch selects MC14433, its
14、 characteristic is the conversion accuracy is high, antijamming ability, each second may transform about 20 times, because the fluid position change is not very quick, therefore may satisfy the monitor fluid position change the need； The control signal output uses the monolithic integrated circuit t
15、o control the 74LS373 latchs way, This may fluctuate the control output port quantity through the fluctuation latch integer way； Because each group request can roll demonstrates in 1 year each class, every day, each months input output total quantity (on 1st 3 classes), normal or the accident power cut data does not lose, therefore has used AT29LV040A (512KB) dodges the fast memory (also to be possible to use FRAM).
