微机原理及应用双语期末考试卷-2013-6

4. Given a number N in the range 0<N<=5, write a program that computes its factorial and saves the result in memory location FACT.(N!=1*2*3*4…*N)
4444H. What are the contents of each register after this sequence of instructions? PUSH AX PUSH CX PUSH BX POP DX POP AX POP BX The result:
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an 8086 microcomputer system 11. In programmable parallel Interface 8255A, the control word must be transferred by only one port ,that is
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SECTION III: Simple answer（choose 5 from item 1 to 6.
5×5= 25）.
4. What are the main functions of I/O port? How does port addressing differ from memory addressing?
7. The address space range of Memory which 8086 CPU can access is while as for I/O’s address range is 8. If DX contains 7C9AH, then the result of “NOT DX” is . .
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9. If one data is 905AH, then the most significant bit (MSB) and the least significant bit ( LSB) are MSB= 10. and , LSB= .
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pins(signals) implement the DMA interface in
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SECTION I: Blank filling question（20×1= 20） 1. Convert the binary 110000111010010 to hexadecimal form, that is 2. 8086 CPU consists of two kinds of Units. One is EU and the other is 3. If DS=4000H, BX=100H, SI=2000H, then the instruction MOV AX, [BX+SI] is to copy data in address and into AX register. . The flag register ， OF= . H. .
SECTION II: Choice（10×1.5= 15） 1. If a data segment deigns at 24000H, then it’s last address could be A. 34000H B. 20FFFH C. 33FFFH D. 24000H ( )
2. If the status of 8086CPU’s pins are: M/IO*=1, RD*=0, then the CPU will ( A. read memory B. read external devices C. write memory D. write external devices 3. Which instruction can set the low four bits of AL to be 1? A. AND AL, 0FH B. OR AL,0FH C. TEST AL, 0FH D. XOR AL, 0FH ( )
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5. If current CS contains 08E0H and IP contains 1F20H, then the next instruction will be fetched from address H.
6. The capacity of a memory chip is 128K× 8, you can see that the number of address lines is , and the number of data lines is . ,
1. What is a physical address? Give one example to describe the forming of physical address.
5. Describes the modes of data transfer in 8086, and lists their features. 2. Name all of the general registers and some of their special functions,give some examples.
3. Memory location 00490H through 00493H contain, respectively, 0A, 9C, B2, and 78. What does AX contain after each instruction? (Assume that SI contains 00490H and that BP contains 0002.) MOV AX, [SI] MOV AX, [SI+1] MOV AX, [SI][BP] ;Result AX= ; Result ; Result . . .
SECTION V: Comprehensive question（1×15= 15, choose only one to finish this section） 1. Here is a 8086 system, it uses 8255A and some switches to control the LEDs. When switch is on, LED is lighted; when switch is off, LED gets dark. The decoding chip 74LS138 is used to help 8255A select chips. The system is like as follow: (note:1.the address bit that is not used is 0; 2.the bit that is not required in 8255A’s Mode Control Word is also 0)
6. what are the address range of A to H port for the decoder in the figure
(Note: the function of 74LS138’s pins refered to last page). 3. Calculate the expression (-89)+67 with binary number, figure the result out with hexadecimal number. And judge whether the result is overflow.
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SECTION IV: Reading and compiling program （5×5= 25） 1. Reading the following program and give the answer.
DATA SEGMENT BLOCK DB ‘rthrarrnks’ COUNT EQU $-BLOCK ;( ) MEM DB 0 MEND DB 0 DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX ;( ) LEA SI,BLOCK MOV CX,COUNT XOR DL,DL ;( ) RETRIVE: MOV AL,[SI] CMP AL,'r' JZ OUTPUT INC BYTE PTR MEM OUTPUT: INC DL CMP DL,4 ;( ) JLE LOOP RETRIVE ; if less than 4 times DEC DL ; rectify the one more time MOV MEND,DL MOV AX,4C00H INT 21H CODE ENDS END START The result is ( ) 2. Registers AX, BX, CX, and DX contain, respectively, 1111H, 2222H, 3333H, and
第 3 页 bly language. Array A contains 15 different integers，Array B contains 20 different integers . Please put the integers which is not only contained in array A but also in array B into array C . (A: 10H,11H,12H,13H,14H,15H,16H,17H,18H,19H,30H,31H,32H,33H,34H B: 11H,15H,16H,18H,19H,31H,33H,35H,36H,37H,39H,51H,52H,53H,54H, 55H,61H,62H,64H,65H)
4. If AX contains 9A54H, the result of “ADD AL, AH” is Is CF= ， ZF= ， SF=