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基于單片機的數(shù)字電壓表設(shè)計畢業(yè)設(shè)計論文-資料下載頁

2025-06-27 20:34本頁面
  

【正文】 he link to include guarding the gate. The external condition is restored to the throne the lawSome 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 wheels, there is no hot water to flow, there is no heat to export, CPU only need in fact keep number value, do not need to count. Can imagine hot 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, antiinterference ability can strengthen 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 application have half electron kilowatthour 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 the external condition of this method. In some occasions, the time of the dormancy will be very long, very effective to improving antiinterference ability.2 . The hardware realizes the main point Restored to the throne regularly unconditionallyGenerally have 2 kinds of methods. ① Use the timer or the specialpurpose 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 made, can also follow the result of this operation , determine to wake time up in alarm next time temporarily, very flexible and convenient. ② 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, already 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. External conditions are restored to the throne Send external condition pulse to and is restored to the throne the end son after having a facelift. To that abovementioned water wheels or the ammeter spend a pulse produced, can use Schmitt39。s trigger to have a facelift。 For writing down the instrument of the biggest or minimum,can use the window parator. In order to realize the electrification that is regulated, can use the electronic electric potential device, establish upper and lower limits with the order of the onechip puter. Reduce cycle and restored to the throne the high electricity at ordinary timesIn Fig3, restored to the throne the signal during high level Tr, the onechip puter is in the state of restoring to the throne, the procedure does not run, antiinterference ability is the strongest。 After the high level, the onechip puter 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 signal, 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 break cycle, low electricity is it measure, hank 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 ant jamming, but is best the unnecessary 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, D9.3. The software realizes the main point is it resume with zero clearing RAM to outputRestore to the throne the last all pin turn high level into , is it should take place unnecessary change for low pin to make regularly, so, should resume the state. of all pins immediately after being restored to the throne. There are 2 kinds of methods : ① Analyze and judge immediately after being restored to the throne this time, provide the state of the pin according to the need。 ② In being RAM it is the last state that e down, these RAM when restored. To the throne regularly can the zero clearing one。 But electricity or manual to restore to the throne when pushing in conformity with zero clearing, is it embody to want when the software is worked outing at the beginning. If calculate time allows, try one39。s best to take method 1. Restore to the throne cycle probability made mistakes to calculate very little, according to 2 for the 2nd time in succession. 4 output end son that narrate connect treatment method of electric capacity in parallel, can reach kind antiinterference realizes crossing over and is restored to the throne alternate time sequence regularly to controlWork in way of restoring to the throne now, start anew and carry out the same procedure repeatedly each time. Can be divided into 2 kinds of situations: ① As to simple to show instrument, carry on measurement, send off showing after being restored to the throne each time, have causality between restoring to the throne twice . need is it switch over to the dormancy to waiting original only. Should pay attention to, measurement, give total time used to show is it is it restore to the throne low electricity at ordinary times to smaller than to want, otherwise can39。t present forever the mistake of the intact executive program. ② For having application that time sequence controlled , after being restored to the throne each
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