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This design takes 89c5 1 single chip microcomputer as the core, and uses dot matrix graphics to display Chinese characters. Display is completed by timing control circuit, control signal circuit and display drive circuit.
This design takes 89c5 1 single chip microcomputer as the core, and uses dot matrix graphic display to display Chinese characters. The display is completed by time sequence control circuit, control signal circuit and display drive circuit.
Key words: column display driver, timing control circuit, serial asynchronous communication mode, display drive circuit, control signal circuit.
catalogue
Thread theory 1.
Chapter 65438 +0 Design Ideas .....................................................................................................................................................................
Chapter II Design Scheme
Chapter 3 Basic Structure
Chapter 4 Hardware Part
4. 1 microcomputer hardware circuit
4. 1. 1 display control circuit
4. 1.2 display drive circuit ............................. 10
4.2 control signal ................................... 12
4.2. 1 column displays data-related signals. ..............................................................................................................................................................
4.2.2 Line number latch input signal 13.
4.2.3 Distinguish the control signals of the upper writing part. ..................................................................................................................................................................
4.2.4 Clear screen signal .................................. 14
The fifth chapter software ..................................... 15.
5. 1 theoretical analysis
5.2 programming ...................................... 17
5.3 Flowchart
5.3. 1 main program flow chart 22
5.3.2 Flow chart of interrupt service program
Chapter VI Conclusion ......................... 24
References -25
Thank you ... thank you ... thank you ... thank you.
5.2 programming
Organization 0000H
SJMP home page: jump to the main program home page.
ORG 0023H
Sientry: ajmp 1sis: serial communication interrupt entry, jump to.
: serial communication interrupt service program SIS
Main: movsp, 60: stack settings
MOV R0, 80H: Point to the RAM area.
Mov r 1, 00: r0, r 1: RAM pointer.
MOV DPTR,1000h: data header address of eprom.
: DPTR:EPROM pointer
MOV A，00
MOVC A, @A+DPTR: reading data from EPROM 1000H.
Invidptr: read 200H bytes from EPRON.
: data to RAM
Push DPL: DPTR into the stack
Push DPH
MOV DPH, r0: DPTR is replaced by RAM pointer.
MOV DPL，R 1
MOVX @DPTR, A: Send data to memory.
DPRT Company
MOV R0, DPH:DPTR store.
DPL MOV r 1
Eject DPH: eject DPTR(EPROM address)
Pop ·DPL
MOV R2, DPH: R2: judge whether it reaches 1200H.
CJNE R2, 12H, REPROM: 200H bytes are not completely transmitted.
Sinit: movtmod, 2 1H: let T 1 mode 2, T0 mode 1.
MOV TH 1, FAH: let the timing of T 1 be 6.51μ s.
SETB 8EH: set TCONBIT6 and open T 1.
Moveth0,00: Set the T0 timer.
MOV TL0，00
MOV R6，7EH
MOV 700h
50H: set to 50H, mode 1, and any = 1.
MOV·PCON, 00: Let PCIN be 0.
MOV 50H，82H
MOV 5 1H，00
SETB·AFH: Open interrupt
SETB ACH: allow serial communication interruption.
SETB 9CH :SCONBIT4，REN= 1
Next CLRC
The initial value of MOV A, R7:R7 is 0.
Add a, 00
MOV R7，A
MOV A, R6: The initial value of R6 is 7E.
02H analog-to-digital converter a
MOV A, 5 1H:5 1 has an initial value of 0.
XRL A，R7 :A=R7？
JNZ DISP 1: No, go to DISP 1.
MOV A, 50H: Wait. The initial value of 50 is 82H.
XRL A，R6 :A=R6？
JNZ 04H: No, go to DISP 1.
MOV·R6, 80 hours: et al., R6 = 80 hours.
MOV 700 yuan
DSP 1:MOV 0，00
TM256 MOV R3，00
TM5 12 MOV R2，00
R6 MOV·DPH:80 hours
MOV·DPL, 7 o'clock sharp
CONT2: MOV R 1，00
Clrb4h: p3bit4 = t0, upper and lower control =0.
Disph: movxa @ dptr: read into RAM.
DPTR company
Inc r 1: r 1: byte count
MOV P 1, a: output a RAM byte data to P 1.
CLR B3H :P3BRT3=INT 1
Setbb3h: int 1 is the input pulse of the shift register.
CLR B5H :P3BRT5=T 1
SETB B5H
Clrb5h: T 1 * * * outputs 8 pulses.
SETB B5H: In other words, it was moved eight times.
Clrb5h: t 1 is the shift pulse of the shift register.
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CJNE R 1， 10H，DISPH:r 1 & lt； & gt 10H, switch to DISPH.
: 10H= 16D， 16*8= 128
Push DPH: If R 1= 10H, DPTR will be put on the stack.
Push SPL
Setbb4h: p3bit4 = t0, up and down control = 1.
CLRC
DPL MOV
Add one, P0H: skip F0H bytes.
MOV DPL Answer: The original DPTR always points to 10H, 10H+F0H.
DPHMOV A: After 256 bytes
ADC A, 00: that is, pointing to the lower half.
MOV·DPH
DISPL: MOVX A，@DPTE
DPTR company
INC R 1
MOV P 1，A
CLR B3H
SETB B3H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CLR B5H
SETB B5H
CJNE R 1，20H，D4H:r 1 & lt； & gt20H, switch to DISPL.
CLR B2H :P3BIT2=INT0
SETB·B2H
MOV P 1, R2: R2 is output to P 1.
MOV·DPTR，0000
MOVX @DPTR, A: Just let the address work.
R2 company
Pop ·DPL
Pop ·DPH
Movie R2, 10H, cont1:R2 <; & gt 10H switch to CONT 1.
Company R3 :R2= 10H
Movies R3, FFH, Tim 256: R3 <; & gtFFH, go to Tim 256.
INC R0 :R3=FFH
CINE R0，02H，Tim 5 12:R0 & lt； & gt02H，TIM5 12
The next LJMP
Tim 5 12:LJMP TM 5 12:$ 2 1
CONT 1: LJMP CONT2
TIM256: AJMP0 TM256
ORG 0800H: serial communication service program
Sis: clr afh: iebit 7 turns off the interrupt.
Clr98h: sconbit0ri clears the receive interrupt.
MOV A，SBUF
XRL A, 3fh: 3fh transmission start flag
Jz dtstart: sbuf = 3fh，go。
SJMP closes: otherwise, it ends.
Dtstart: movdptr, #000 1H: Let the address act.
MOVX @DPTR, a:00 off decoding, 0 1 on decoding.
: send clear signal SRCLR* to 74LS595.
CLR B2H: Input the cleared result into the column output latch.
: Complete the display closing operation.
MOV DPTR，#8000H
MOV· Spoff
Waitt: jnb99h, waitt: sconb 1ti = 0, waiting for the launch to be completed.
CLR 99H :SCONB 1TI= 1
Waitr: jnb98h, waitr: sconb0ri = 0, waiting for the completion of acceptance.
CLR 98H :SCONB0RI= 1
MOV A, SBUF: transmission byte count l
MOV 50H，A
Continue: MOV· Spoff
Wartt 1: JBC 99h, wartt1:sconb1ti =1,the launch is complete.
Sjmpwait t1:sconb1ti = 0, waiting for the startup to be completed.
Waitr 1:jbc 98h, rdata: sconb0ri = 1, reception completed.
Sjmp warr 1:sconb 0 ri = 0, waiting to be received.
RDATA: MOVA, SBUF: read in the display data.
MOV @DPTR
DPTR company
DPH MOV
XRL A，50H
JNZ continues: (a) < & gt(50H), continue to receive.
DPL MOV A:(A)=(50 hours)
XRL A，5 1H
JNZ continues: (a) < & gt(5 1H), continue to collect.
MOV ASBUF, a: (a) = (51h) waitte: jnb99h, waitte: sconb 1ti = 0, waiting for the launch to be completed.
CLR 99H :SCONB 1TI= 1
MOV DPTR, 8000 hours
MOV 0，20H
MOV r 1. 10H
MOV R6，80H
MOV 700 yuan
Closed: SETB AFH
Retty
ORG 0800H
Display data: DB 00, 00, 00, 00, 00, 00, 00, 00, 00, 00