单片机英文资料+英文文献.docx

1、单片机英文资料+英文文献单片机英文资料+英文文献Dormancy of the one-chip computer-restore to the throne in the operation way and improve anti- interference ability Introduce a kind of dormancy of using- restore to the throne in theoperation way and improve the anti-interference ability method of the one-chip computer;Analy

2、se its scope of application, provide and use the circuit concretly; Combine the instance, analyse the characteristic of the hardware and software design under these kind of operation way. Keyword: One-chip computer Restore to the throne /dormancy anti-interference Foreword With the development at fu

3、ll speed of the microelectric technique, the performance of the one-chip computer improves rapidly, demonstrate the outstanding advantage in the operation, logic control, intelligent respect, replaced and enlarged the measuring that the circuit made up, control circuit by digital logical circuit, op

4、eration originally to a great extent, use very extensivly. But because it have system halted, procedure run critical defect of flying etc, make it limit in a lot of important application of occasion. A lot of technology in anti-interference , for example set up the software trap, add thehardware to

5、guard the gate in dogs circuit etc, can make this problem havebetter settlement, but still the existing problem: ? Guard the gate dog at the movement, mean and appear mistake already and run some time, this is not allowed in some occasions; ?Procedure appear circulation mistake very much sometimes,

6、but just guard the gate dog control link include and enter, adopt and guard the gate as to such a mistake dog unable to discern; ? In measure and control cycle among the long system, one-chip computer spend wait for the peripheral hardware a large amount of time, will be interfered too when carry ou

7、t and wait for the order. To these situations, we have tried the method restored to the throne voluntarily in practice, alternate pulse of adopting etc or restore to the throne waking according to external terms to the one-chip computer up. After being restored to the throne each time, the one-chip

8、computer carries out the corresponding procedure, enters dormancy in time after finishing carrying out the task, wait to be restored to the throne nextly. Have solved above-mentioned problems well with this method , and has got better result in the agricultural voltage transformer comprehensive prot

9、ector experiment. Now take 51 serial one-chip computers as an example and probe into the concrete principle and implementation method, restored to the throne the signal as the high level. 1.A principle and implementation method 1.1 Restored to the throne the law regularly unconditionally Use timer,

10、special-purpose clock chip or other pulse generator, produce signal of restoring to the throne regularly according to interval that set for. This kind of method is especially suitable for the measuring instrument. In not running actually, sample the analog quantity of introduction with A/D converter

11、 often, then store showing. This course is very fast, but steady for reading, the data per second are only upgraded 1 -2 times, a large amount of time of CPU is used for waiting. Let CPU carry out and enter dormancy directly after the task , restore to the throne and wake by external world up It car

12、ry out the next operation, this is to restore to the throne the law regularly In this way can make anti-interference ability strengthen greatly , have 2 points mainly: ?. At the dormancy, procedure stop run, can appear PC indicator disorderly procedure that causes run and fly. Work time in dormancy

13、proportion 1:9, that is to say 1 s have 0.1 time of s used for measuring, sending off showing, there is time dormancy of 0.9s, the probability that the procedure is interfered is 1/10 while running at full speed, whole anti-interference ability raise by 10 times. ? Because every 1s is restored to th

14、e throne once unconditionally, once present the system halted during a job, can certainly resume when restored to the throne next time. As to only instrument that show, some reading mistake that 1s appear accidentally there is no memory to the next measurement, be could bear , belong to “pass” mista

15、ke. This kind is restored to the throne the advantage of dogs circuit for guarding the gate regularly, first, change waiting time into a dormancy state, time to shorten and may be interfered; Second, avoided happenning that the dog controls the death circulation of the link to include guarding the g

16、ate. 1.2 The external condition is restored to the throne the law Some arrival that export or measure is controlled by the outside. For instance, the hot form. of heating, rotate the pulse produced and calculate heat by hot water water wheels, there is no hot water to flow, there is no heat to expor

17、t, CPU only need in fact keep number value, do not need to count. Can imagine hot water water wheels rotate when parking warm , CPU idle in will it be will it be one season autumn spring and summer, If let dormancy its , measure have water wheels pulse constantly, anti-interference ability can stren

18、gthen greatly. So, so long as link up the restoring to the throne of the pulse of the water wheels and CPU, the water wheels rotate a circle each time, CPU is restored to the throne once, hot form. can work normally , this is restored to the throne the law by the external condition . Similar applica

19、tion have half electron kilowatt-hour meter , go on one count just when the machinery degree wheels and transfers to a circle, users do not need the electricity, CPU has been knowing the dormancy all the time . The restoring to the throne in the interval not to be regular, but confirmed according to

20、 the external condition of this method. In some occasions, the time of the dormancy will be very long, very effective to improving anti-interference ability. 2 .The hardware realizes the main point 2.1 Restored to the throne regularly unconditionally Generally have 2 kinds of methods. ? Use theitime

21、r or the special-purpose clock chip to be restored to the throne. Fig1, in order to use the timing circuit that 555 circuit makes up; Can use the clock chips of X1126 ,etc too , wake CPU up with the alarm signal after setting up warning time. This kind of method is suitable when the long interval is

22、 made, can also follow the result of this operation ，determine to wake time up in alarm next time temporarily, very flexible and convenient. ? The signal of using the system to be inherent is as reducing the pulse regularly. Use 50Hz worker power make reducing after having a facelift frequently, alr

23、eady omit the timer, gathered the corresponding signal for the phase place which measured the electric current signal at the same time, as Fig. 2 shows. 2.2 External conditions are restored to the throne Send external condition pulse to and is restored to the throne the end son after having a faceli

24、ft. To that above-mentioned water wheels or the ammeter spend a pulse produced, can use Schmitts trigger to have a facelift; For writing down the instrument of the biggest or minimum，can use the window comparator. In order to realize the electronization that is regulated，can use the electronic elect

25、ric potential device, establish upper and lower limits with the order of the one-chip computer. 2.3 Reduce cycle and restored to the throne the high electricity at ordinary times In Fig3, restored to the throne the signal during high level Tr, the one-chip computer is in the state of restoring to th

26、e throne, the procedure does not run, anti-interference ability is the strongest; After the high level, the one-chip computer begins to hold the conduct procedure. That is to say, are restored to the throne and suitable for the time that the procedure carries out during the low level Td of the signa

27、l, this time should be greater than the execution cycle of the procedure each time. It is restore to the throne cycle and restore to the throne high level of signal take empty than very much important to choose rationally. As to simple to show instrument, restore to the throne cycle determine data b

28、reak cycle, low electricity is it measure, hancl over all time shown to greater than to want at ordinary times; Otherwise, cant present forever the mistake of the intact executive program.Monolithic integrated circuit in Ts and Tr period all can effectively the antijamming, but is best the unnecessa

29、ry time arrangement in Tr. When the program time is long, when as far as possible the request reduces Tr, may join the differentiating circuit, like chart 1 center C30, R26, D9. 2.4 Treatment of output end sons (1) Restore to the throne straight pulse During all I/O mouth of one-chip computer turn i

30、nto the high level when restoring to the throne. That is to say output for low pin normally, will according to restore to the throne cycle appear the width for the straight pulse of Tr. This straight pulse will influence the normal output, 2 methods are dealt with: ? Connect in parallel electric cap

31、acity suppress , capacity confirm according to Tr time that restore to the throne on the son in end. Reducing Tr can be reduced and connected the electric capacity in parallel. ? It is invalid to design the peripheral circuit into the high level. (2) Fault-tolerant Choose the capacity that the outpu

32、t end connects the electric capacity in parallel fault-tolerantly and properly, can realize fault-tolerant control. Reduced cycle in a certain, because interfered exporting the wrong level. Because the keeping function of electric capacity, cant still enable exporting the change to the valid level within this cycle; Next cycle , the mistake is corrected. So, so long as does not make mistakes in 2 cycles in succession, it is very fault-tolerant to export Certainly, this kind of method will