單片機(jī)原理與接口技術(shù)習(xí)題參考答案(文件)
【正文】 00H—3FFFFH習(xí)題七一、 單項(xiàng)選擇題1. A2. D3. D4. D5. C二、 填空題1. C2. 3,23. PC4，PC54. 00000011B5. 輸出緩沖器滿信號(hào)三、 簡答題1. 10110100B,11000100B2. 8255A口具有輸入、輸出兩個(gè)鎖存器，B口只具有輸出鎖存器。若低優(yōu)先級(jí)按鍵一直閉合，優(yōu)先級(jí)高的按鍵按下不會(huì)出現(xiàn)優(yōu)先級(jí)高的按鍵控制的燈亮，保持原樣。循環(huán)優(yōu)先級(jí)是指當(dāng)某個(gè)中斷源受到中斷服務(wù)后，它的優(yōu)先級(jí)自動(dòng)降為最低，相鄰低一級(jí)中斷源的優(yōu)先級(jí)升為最高，分為優(yōu)先級(jí)自動(dòng)循環(huán)方式和優(yōu)先級(jí)特殊循環(huán)方式。4. 主片IR0，主片IR1，從片IR0，從片IR1，從片IR2，從片IR3，從片IR4，從片IR5，從片IR6，從片IR7，主片IR3，主片IR4，主片IR5，主片IR6，主片IR7。特殊EOI通過軟件方法向8259A發(fā)一個(gè)中斷結(jié)束命令，中斷命令中指出要結(jié)束哪一級(jí)中斷源，從而使ISR中的相應(yīng)位清0。作用是啟動(dòng)、控制定時(shí)/計(jì)數(shù)信號(hào)。3. 10110111B四、 應(yīng)用編程題1. ORG 0000H LJMP MAIN ORG 0003H LJMP INT ORG 0030H MAIN: MOV SP,50H SETB EA SETB EX0 SETB IT0 MOV DPTR,7FFFH MOV A,00010000B MOVX DPTR,A MOV DPTR,7FFCH MOV A,1 MOVX DPTR,A SJMP $ INT: CLR RETI END2. ORG 0000H LJMP MAIN ORG 0030H MAIN: MOV DPTR,7FFFH MOV A,00110111B MOVX DPTR,A MOV DPTR,7FFCH MOV A,00H MOVX DPTR,A MOV A,10H MOVX DPTR,A MOV DPTR,7FFFH MOV A,01110111B MOVX DPTR,A MOV DPTR,7FFDH MOV A,00H MOVX DPTR,A MOV A,10H MOVX DPTR,A SJMP $ END習(xí)題十一、 單項(xiàng)選擇題1. B2. D3. C4. A5. B二、 填空題1. 并行通信，串行通信2. 低，1，高，23. 84. 可編程通用同步/異步接收發(fā)器5. 40H6. 01111010B7. TxRDY=1,TxEN=1，=08. 片選信號(hào)，I/O時(shí)鐘，串行輸入，串行輸出三、 簡答題1. 異步通信中數(shù)據(jù)是一幀一幀傳送的。異步通信和同步通信的比較（1）異步通信簡單，雙方時(shí)鐘可允許一定誤差。（2）異步通信只適用于點(diǎn) 點(diǎn)，同步通信可用于點(diǎn) 多。3. 接收時(shí)鐘/發(fā)送時(shí)鐘頻率是波特率的132或64倍。4. 。這樣，MCU在輸出1位SCK時(shí)鐘的同時(shí)，將使接口芯片串行左移，（模擬MCU的MISO線），（模擬MCU的MOSI線）輸出1位數(shù)據(jù)（先為高位）至串行接口芯片。四、 應(yīng)用編程題1. 甲 ORG 0000H AJMP DELAY ORG 0030H DELAY: MOV R4,10 D0: MOV R5,125 D1: MOV R6,200 D2: DJNZ R6,D2 DJNZ R5,D1 DJNZ R4,D0 SEND: MOV TMOD,20H MOV TH1,0FAH MOV TL1,0FAH MOV SCON,50H MOV PCON,00H SETB TR1 CAL: MOV SBUF,0AAH JNB TI,$ CLR TI JNB RI,$ CLR RI MOV A,SBUF CJNE A,0BBH,CAL LOP: MOV SBUF,P1 JNB TI,$ CLR TI MOV SBUF,0FFH JNB TI,$ CLR TI JNB RI,$ CLR RI MOV A,SBUF CJNE A,0FFH,LOPEND 乙 ORG 0000H AJMP RECE ORG 0030H RECE: MOV TMOD,20H MOV TH1,0FAH MOV TL1,0FAH MOV SCON,50H MOV PCON,00H SETB TR1 RESP: JNB RI,$ CLR RI MOV A,SBUF CJNE A,0AAH,RESP JES: MOV SBUF,0BBH JNB TI,$ CLR TI LOP: JNB RI,$ CLR RI MOV A,SBUF MOV R0,30H MOV R0,A JNB RI,$ CLR RI MOV A,SBUF CJNE A,0FFH,LOP MOV A,R0 MOV P1,A MOV SBUF,0FFH JNB TI,$ CLR TI END2. 甲 ORG 0000H AJMP DELAY ORG 0030H DELAY: MOV R4,10 D0: MOV R5,125 D1: MOV R6,200 D2: DJNZ R6,D2 DJNZ R5,D1 DJNZ R4,D0 SEND: MOV TMOD,20H MOV TH1,0FDH MOV TL1,0FDH MOV SCON,50H MOV PCON,00H SETB TR1 SEND1: MOV R0,0 MOV DPTR,TAB LOP: MOV A,R0 MOVC A,A+DPTR MOV SBUF,A JNB TI,$ CLR TI INC R0 CJNE R0,10,LOP TAB: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH END 乙 ORG 0000H AJMP RECE ORG 0030H RECE: MOV TMOD,20H MOV TH1,0FDH MOV TL1,0FDH MOV SCON,50H MOV PCON,00H SETB TR1 LOP: MOV R0,0 MOV R1,30H LOP1: JNB RI,$ CLR RI MOV A,SBUF MOV R1,A INC R1 INC R0 CJNE R0,10,LOP1 DP0: MOV R1,30H DP1: MOV P1,R1 ACALL DELAY INC R1 CJNE R1,3AH,DP1 SJMP DP0DELAY: MOV R4,10 D0: MOV R5,125 D1: MOV R6,200 D2: DJNZ R6,D2 DJNZ R5,D1 DJNZ R4,D0 RET END3. ORG 0000H LJMP MAIN ORG 0030H MAIN: MOV DPTR,0FEFFH MOV A,0 MOV R0,3 STI: MOVX DPTR,A NOP DEC R0 JNZ STI MOV A,40H MOVX DPTR,A NOP NOP MOV A,7EH MOVX DPTR,A NOP NOP MOV A,31H MOVX DPTR,A NOP NOP SENDCHAR: MOV R1,00H MOV R7,0FFH WAITSEND: MOVX A,DPTR RRC A JNC WAITSEND MOV A,R1 MOV DPTR,0FEFEH MOVX DPTR,A INC R1 DJNZ R7, WAITSEND END ORG 0000H LJMP MAIN ORG 0030H MAIN: MOV DPTR,0FEFFH MOV A,0 MOV R0,3 STI: MOVX DPTR,A NOP DEC R0 JNZ STI MOV A,40H MOVX DPTR,A NOP NOP MOV A,7EH MOVX DPTR,A NOP NOP MOV A,16H MOVX DPTR,A NOP NOP RECECHAR: MOV R1,00H MOV R7,0FFH WAITRECE: MOVX A,DPTR RRC A RRC A JNC WAITRECE MOV DPTR,0FEFEH MOVX A, DPTR MOV R1,A INC R1 DJNZ R7, WAITRECE END習(xí)題十一一、 單項(xiàng)選擇題1. D2. C3. B4. D5
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