单片机英文资料+英文文献

1、introduction:with the development at full 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

2、 circuit by digital logical circuit, operation 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

3、 the software trap, add thehardware to guard the gate in dog's 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

4、circulation mistake very much sometimes, 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 tim

5、e, will be interfered too when carry out 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

6、 to the throne each time, the one-chip 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

7、 voltage transformer comprehensive protector 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 method1. 1 restored to the throne the la

8、w regularly unconditionallyuse timer, 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. tn not running actually, sample the analog quant

9、ity of introduction with a/d converter 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 thron

10、e and wake by external world up it carry 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

11、 causes run and fly. work time in dormancy 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

12、 times. because every is is restored to the 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 is appear accidentally there is no memory to the next measureme

13、nt, be could bear , belong to“pass" mistake. this kind is restored to the throne the advantage of dog's 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 deat

14、h circulation of the link to include guarding the gate.1. 2 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 water wheels, there

15、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 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 pul

16、se constantly, anti-interference 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 t

17、he law by the external condition . similar application 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 inte

18、rval 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 anti-interference ability.2 .the hardware realizes the main point2. 1 restored to the throne regularly unconditionallygenerally have 2 kinds of methods. use theitimer or the special-purpose clock chip to be restored to the throne. figi, in order to use the timing c