Five steps to teach you how to check SCM is working correctly -

recently finally have plenty of time to learn computer composition principle and single-chip microcomputer principle, simple talk about your feelings of the two courses.

1。 First say computer two branches: general-purpose computer, single chip microcomputer. Are two different development direction. We know that the computer has five parts, namely the arithmetic unit controller memory input device input devices.

microcontroller is integrated in a IC chip, IC chips used arithmetic unit controller and I/o interface, equivalent to a computer system. And general computer is points of the module, such as memory, CPU, video card, the equipment is through the system bus is connected into a computer system. So it can be seen that SCM is a micro computer system, it is because the small, the price is cheap, very suitable for application in embedded system. Of course the function of MCU, there is no universal computer so powerful.

2。 Again computer composition principle of computer composition principle is to introduce the basic principle of the computer, not involving the specific models, such as Intel 8086, with specific models for introduction and explanation. Microcomputer principle and interface technology, this course is 8086 as the object of interpretation. , of course, this paper introduces the principle of computer and can be introduced in a specific models, for example, but if too for a particular model, cannot reflect the principle of computer basis.

3。 Single-chip microcomputer principle, I have seen some of the single chip microcomputer principle books, are MCS - 51 single chip microcomputer to explain, because of 51 kernel single-chip computer is very easy to learn, and use is very extensive. Arm is a single-chip microcomputer, is a kind of 32 micro controller. And 51 single chip microcomputer is 8-bit microcontroller.

4。 Assembly language of computer constitute principle of microcomputer principle and interface technology of computer architecture that is computer science and technology professional course. Of course learning, if we can put this all learn a few course, deeper understanding of the computer, because a separate course content is limited.

5。 Have to say, today's course is so-so so-so, and this is really not self-study. Hard all the way. Later will learn some industrial control aspects of the content, PLC controller ARM.

if there is a single chip microcomputer system does not work properly, can complete the following steps to check:

1. Check door dog reset output, if possible on the circuit board to add an LED, the drop-down, it looks more convenient; If the watchdog reset signal, down.

2。 Single chip microcomputer and see if there is something wrong with pin; General programmer can write the procedure that SCM is good; Best to prepare a verified at hand MCU, inside there is a simple program, for example, in one mouth line 1 1 second duty ratio of the square wave output, etc. , can use a multimeter to measure.

3。 Check disk capacity, some ceramics capacitor quality no, simply changed; In the device, by the way, it is best to use tin with absorption, sucked clean, tin welding dish again pull out device, it doesn't a hole in the welding dish; The new ceramics capacitor welding up again, with a multimeter measure is good welding again.

4。 Check the above three points are no problem, then only change the crystals; Change again when crystals to bear in mind that want to buy a good crystals, some brands are better quality.

5。 Above in accordance with the above steps detection, peripheral chips will not remove; Because there is a peripheral device failure of single chip microcomputer minimum system didn't work.

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