1. Briefly describe the main modules of a single chip microcomputer system, and explain the direction of data flow and control flow between modules. Briefly introduce the design principle of single chip microcomputer application system (interview topic of Shi Lanwei).
2. Draw the connection diagram of 803 1 and 27 16(2K*8ROM). March 8th decoder is required, and P2.5, P2.4 and P2.3 of 803 1 are involved in decoding. The basic address range is 3000H-3FFFH. Is there any overlapping address for this 27 16? What is the basis? If yes, write down the overlapping address range of each piece 27 16 (interview topic of Shi Lanwei)
3. Design a schematic diagram of an 8* 16 keyboard and eight digital tubes with 805 1 (commonly used) (interview topic of Shi Lanwei).
4. What does 4.PCI bus mean? What are the main characteristics of PCI bus? (Stone interview topic)
5. The concept of interruption? Briefly describe the process of interruption (interview topic of Shi Lanwei)
6. If there are several types of MCU interrupts, what problems should be paid attention to when writing interrupt programs? (unknown)
7. The speed of DC motor is controlled by open-loop pulse speed regulation system, and the program is completed by 805 1. The simple principle is as follows: the speed is controlled by the duty cycle of P3.4 output pulse, and the greater the duty cycle, the faster the speed; The duty ratio is set by eight switches K7-K0, which are directly connected to the P 1 port ("The switch is set to 0 at the bottom and" 1 "at the top to form an eight-bit binary number n), and the duty ratio is required to be N/256 (Shi Lanwei's interview topic).
The following program uses counting method to realize this function. Please fill in the spare parts completely.
MOV P 1，#0FFH
LOOP 1 :MOV R4，#0FFH
-
MOV R3，#00H
Second loop: MOV A, P 1
-
SUBB A，R3
JNZ SKP 1
-
MOV C，70H
MOV P3.4，C
Call Delay: This delay subroutine is omitted.
-
-
AJMP LOOP 1
8. Single chip microcomputer does not work after power on. What should I check first? (Eastcom test questions)
9. What is a PC chipset? (Yang Zhi Electronic Written Test)
Chipset is the core component of the motherboard. According to the different arrangement positions on the motherboard, it is usually divided into north bridge chip and south bridge chip. The north bridge chip provides support for CPU type and main frequency, memory type and maximum capacity ISA/PCI/AGP slot, ECC error correction and so on. South Bridge chip supports KBC (Keyboard Controller), RTC (Real-time Clock Controller), USB (Universal Serial Bus), Ultra DMA/33(66)EIDE data transmission mode and ACPI (Advanced Energy Management).
In addition to the most common north-south bridge structure, chipset is developing to a more advanced accelerated hub architecture. Intel's' 8xx series chipset is the representative of this kind of chipset. It connects some subsystems such as IDE interface, sound effect, modem and USB directly to the main chip, which can provide a bandwidth twice as wide as PCI bus, reaching 266 MB/s..
10, if the resume also says that I have worked as a cpu, I will ask questions like how the cpu works and the pipeline (unknown).
1 1, the basic components of the computer and their respective functions (Eastcom test)
12, please draw a typical logic diagram (written test in Hanwang) of the interface circuit (data interface, control interface, memory/buffer) between the input device and the microcomputer.
13, main part cache or something (via 2003.6438+0 1.06 Shanghai written test questions)
14. Difference between synchronous and asynchronous transmission (unknown)
15, Similarities and differences, characteristics and comparison between serial communication and synchronous communication (Huawei interview)
What is TTL logic corresponding to 16 and RS232c high-level pulse? (negative logic? (Huawei interview questions)
;