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Mình đang làm mô phỏng mạch đo nhịp tim hiển thị số. Mình dùng nguồn SIN để làm tín hiệu đầu vào. Nguồn SIN 2mV khuếch đại 2000 lần rùi qua các bộ lọc loại bỏ tần số nhiễu. Cuối cùng qua một mạch so sánh trễ để chuyển từ tín hiệu sin sang tín hiệu xung đưa vào ngõ P3.5 89C51 để đếm. Phần mềm mình đếm xung trong 15s rùi nhân 4 ra nhịp đập trong một phút. Hiện tại mình vẫn chưa mô phỏng được trên proteus 8.0. Mình gửi phần cứng với code( CODE tham khảo trên mạng) lên , mong các bạn giúp đỡ. Mình sắp bảo vệ đồ án rùi. Cảm ơn các bạn !!!
CODE :
ORG 000H // origin
MOV DPTR,#LUT // moves starting address of LUT to DPTR
MOV P1,#00000000B // sets P1 as output port
MOV P0,#00000000B // sets P0 as output port
MAIN: MOV R6,#230D // loads register R6 with 230D
SETB P3.5 // sets P3.5 as input port
MOV TMOD,#01100001B // Sets Timer1 as Mode2 counter & Timer0 as Mode1 timer
MOV TL1,#00000000B // loads TL1 with initial value
MOV TH1,#00000000B // loads TH1 with initial value
SETB TR1 // starts timer(counter) 1
BACK: MOV TH0,#00000000B // loads initial value to TH0
MOV TL0,#00000000B // loads initial value to TL0
SETB TR0 // starts timer 0
HERE: JNB TF0,HERE // checks for Timer 0 roll over
CLR TR0 // stops Timer0
CLR TF0 // clears Timer Flag 0
DJNZ R6,BACK
CLR TR1 // stops Timer(counter)1
CLR TF0 // clears Timer Flag 0
CLR TF1 // clears Timer Flag 1
ACALL DLOOP // Calls subroutine DLOOP for displaying the count
SJMP MAIN // jumps back to the main loop
DLOOP: MOV R5,#252D
BACK1: MOV A,TL1 // loads the current count to the accumulator
MOV B,#4D // loads register B with 4D
MUL AB // Multiplies the TL1 count with 4
MOV B,#100D // loads register B with 100D
DIV AB // isolates first digit of the count
SETB P1.0 // display driver transistor Q1 ON
ACALL DISPLAY // converts 1st digit to 7seg pattern
MOV P0,A // puts the pattern to port 0
ACALL DELAY
ACALL DELAY
MOV A,B
MOV B,#10D
DIV AB // isolates the second digit of the count
CLR P1.0 // display driver transistor Q1 OFF
SETB P1.1 // display driver transistor Q2 ON
ACALL DISPLAY // converts the 2nd digit to 7seg pattern
MOV P0,A
ACALL DELAY
ACALL DELAY
MOV A,B // moves the last digit of the count to accumulator
CLR P1.1 // display driver transistor Q2 OFF
SETB P1.2 // display driver transistor Q3 ON
ACALL DISPLAY // converts 3rd digit to 7seg pattern
MOV P0,A // puts the pattern to port 0
ACALL DELAY // calls 1ms delay
ACALL DELAY
CLR P1.2
DJNZ R5,BACK1 // repeats the subroutine DLOOP 100 times
MOV P0,#11111111B
RET
DELAY: MOV R7,#250D // 1ms delay
DEL1: DJNZ R7,DEL1
RET
DISPLAY: MOVC A,@A+DPTR // gets 7seg digit drive pattern for current value in A
CPL A
RET
LUT: DB 3FH // LUT starts here
DB 06H
DB 5BH
DB 4FH
DB 66H
DB 6DH
DB 7DH
DB 07H
DB 7FH
DB 6FH
END
code.txtMO PHONG PROTEUS.zip
CODE :
ORG 000H // origin
MOV DPTR,#LUT // moves starting address of LUT to DPTR
MOV P1,#00000000B // sets P1 as output port
MOV P0,#00000000B // sets P0 as output port
MAIN: MOV R6,#230D // loads register R6 with 230D
SETB P3.5 // sets P3.5 as input port
MOV TMOD,#01100001B // Sets Timer1 as Mode2 counter & Timer0 as Mode1 timer
MOV TL1,#00000000B // loads TL1 with initial value
MOV TH1,#00000000B // loads TH1 with initial value
SETB TR1 // starts timer(counter) 1
BACK: MOV TH0,#00000000B // loads initial value to TH0
MOV TL0,#00000000B // loads initial value to TL0
SETB TR0 // starts timer 0
HERE: JNB TF0,HERE // checks for Timer 0 roll over
CLR TR0 // stops Timer0
CLR TF0 // clears Timer Flag 0
DJNZ R6,BACK
CLR TR1 // stops Timer(counter)1
CLR TF0 // clears Timer Flag 0
CLR TF1 // clears Timer Flag 1
ACALL DLOOP // Calls subroutine DLOOP for displaying the count
SJMP MAIN // jumps back to the main loop
DLOOP: MOV R5,#252D
BACK1: MOV A,TL1 // loads the current count to the accumulator
MOV B,#4D // loads register B with 4D
MUL AB // Multiplies the TL1 count with 4
MOV B,#100D // loads register B with 100D
DIV AB // isolates first digit of the count
SETB P1.0 // display driver transistor Q1 ON
ACALL DISPLAY // converts 1st digit to 7seg pattern
MOV P0,A // puts the pattern to port 0
ACALL DELAY
ACALL DELAY
MOV A,B
MOV B,#10D
DIV AB // isolates the second digit of the count
CLR P1.0 // display driver transistor Q1 OFF
SETB P1.1 // display driver transistor Q2 ON
ACALL DISPLAY // converts the 2nd digit to 7seg pattern
MOV P0,A
ACALL DELAY
ACALL DELAY
MOV A,B // moves the last digit of the count to accumulator
CLR P1.1 // display driver transistor Q2 OFF
SETB P1.2 // display driver transistor Q3 ON
ACALL DISPLAY // converts 3rd digit to 7seg pattern
MOV P0,A // puts the pattern to port 0
ACALL DELAY // calls 1ms delay
ACALL DELAY
CLR P1.2
DJNZ R5,BACK1 // repeats the subroutine DLOOP 100 times
MOV P0,#11111111B
RET
DELAY: MOV R7,#250D // 1ms delay
DEL1: DJNZ R7,DEL1
RET
DISPLAY: MOVC A,@A+DPTR // gets 7seg digit drive pattern for current value in A
CPL A
RET
LUT: DB 3FH // LUT starts here
DB 06H
DB 5BH
DB 4FH
DB 66H
DB 6DH
DB 7DH
DB 07H
DB 7FH
DB 6FH
END
code.txtMO PHONG PROTEUS.zip
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