侣醋躺笔洛常较布拔咐愁型长
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起止时间:2021-02-26到2021-05-31
更新状态:已完结
Lesson 1 Basic Knowledge of Microcomputer Unit Testing
1、 Information in E²PROM
A:needs to be erased with special equipment UV
B:is solidified and cannot be erased
C:is the same as the reading and writing speed of RAM
D:can be erased electrically
答案: can be erased electrically
2、 Binary 11010110 is converted to hexadecimal as
A:DCH
B:ACH
C:D6H
D:A6H
答案: D6H
3、 Which of the following are part of the computer
A:Printer
B:Microprocessor
C:Interface adapter
D:Memory
答案: Microprocessor;
Interface adapter;
Memory
4、 The data in RAM is not lost after power-off.
A:正确
B:错误
答案: 错误
5、 A single chip is a chip.
A:正确
B:错误
答案: 正确
6、 The microprocessor includes an arithmetic unit and
答案: Controller
Lesson 2 the Structure and Principle of Single Chip Microcomputer Unit Testing
1、 What is stored in the program counter PC
A:The address of the next instruction to be executed by the CPU.
B:The address of the memory.
C:The next instruction to be executed by the CPU.
D:The data of the memory.
答案: The address of the next instruction to be executed by the CPU.
2、 What is the second function of P2 port?
A:Access data from off-chip memory.
B:The input of external Interrupt.
C: Access the address of the upper 8 bits of the off-chip memory.
D: Access the address of the lower 8 bits of the off-chip memory.
答案: Access the address of the upper 8 bits of the off-chip memory.
3、 Suppose the frequency of the crystal oscillator is 12MHZ, what is the time of one machine cycle?
A:0.167 μs
B:0.0833 μs
C:4 μs
D:1 μs
答案: 1 μs
4、 Which one of these 4 ports is without the second function?
A:P3
B:P1
C:P0
D:P2
答案: P1
5、 The power supply voltage of the microcomputer power supply is 220V
A:正确
B:错误
答案: 错误
6、 The interrupt vector address is the first address of the space reserved for each interrupt source in ROM.
A:正确
B:错误
答案: 正确
7、 Each bit in the bit addressable area has a bit address, and the bit address representation is the same as the byte address representation.
A:正确
B:错误
答案: 正确
Lesson 3 Timer Unit Testing
1、 Timed working mode is to count
A:Instruction cycle
B:Clock cycle
C:Oscillation period
D:Machine cycle
答案: Machine cycle
2、 The gate control bit is 0, which means that the timer is turned on?
A:Only controlled by TR0
B:Controlled by TR0 and INT0 simultaneously
C:Simultaneously controlled by TR0 and INT1
D:Only controlled by INT0
答案: Only controlled by TR0
3、 When T0 works in mode 3, it is two 8-bit timers. When the upper 8 bits are full and overflow, the overflow flag is ( )
A:TR0
B:TF0
C:TF1
D:TR1
答案: TF1
4、 When the timer T1 generates an interrupt ( ) bit will be 1
A:TR0
B:TF1
C:TF0
D:TR1
答案: TF1
5、 The counting mode is to count the external pulse of P0 port
A:正确
B:错误
答案: 错误
6、 The working mode register TMOD is not bit addressable
A:正确
B:错误
答案: 正确
7、 When the timer works in mode 2, when the lower 8 bits are full and overflow, the upper 8 bits reload the timer constant into the lower 8 bits, and no interrupt is generated at this time.
A:正确
B:错误
答案: 错误
8、 Timer interrupt refers to applying for interrupt to the CPU when the timer is full and overflows.
A:正确
B:错误
答案: 正确
Lesson 4 Interrupt System Unit Testing
1、 The interrupt flag bit of external interrupt 1 is __
A:TI
B:IE1
C:IT1
D:TF1
答案: IE1
2、 Which of the following input/output methods is processed by the CPU, and avoids the disadvantages of “requires peripherals to always be in a ready state” and “CPU must wait during processing”.
A:Unconditional transmission
B:Interrupt method
C:Query transmission
D:DMA method
答案: Interrupt method
3、 If the interrupt service program of the timer/counter 0 of a MCS-51 single-chip microcomputer system is placed in a space at the beginning of the 3000h address in the program storage area, the instruction LJMP 3000h that jumps to the interrupt service program of the timer/counter 0 should be placed in the ROM address area at the beginning of the ( ) interrupt vector address.
A:0032H
B:0003H
C:000BH
D:0013H
答案: 000BH
4、 When 89C51 single chip microcomputer allows CPU to respond to interrupt request of serial port, its ( ) bit in ie must be 1.
A:ET1and EA
B:EX0 and ET0
C:EA and ET0
D:ES and EA
答案: ES and EA
5、 When the serial port sends an interrupt request to the CPU of the MCU, if the CPU allows and accepts the interrupt request, the CPU will automatically go to the following address ( ) to execute.
A:0023H
B:0013H
C:000BH
D:0003H
答案: 0023H
6、 Among the five interrupt sources, the software can determine whether the interrupt level of each interrupt source is high or low, but in the same level, the highest priority of queuing by hardware is ( ) interrupt.
A:External interrupt INT0
B:Timer T1
C:Timer T0
D:External interrupt INT1
答案: External interrupt INT0
7、 In the interrupt allow register, the EA bit of the interrupt control register is used to？
A:Allowed control bit of an interrupt source
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