Single chip drive digital tube dynamic display technology, LED Displayer Program

"Single chip microcomputer driven nixie tube dynamic display technology, LED display program" Key words: nixie tube dynamic display 1. The experimental task is shown in the figure. Port P0 is connected to the font code pen segment of the dynamic nixie tube, port P2 is connected to the digital selection end of the dynamic nixie tube, and P1.7 is connected to a switch. When the switch is connected to high level, the word "12345" is displayed; When the switch is connected to low level, the word "hello" is displayed. 2. Circuit schematic diagram 3. Hardware connection on the system board (1). Connect p0.0/ad0-p0.7/ad7 in the "single chip microcomputer system" area to the A-H port in the "dynamic digital display" area with 8-core flat cable（ 2) Connect p2.0/a8-p2.7/a15 in the "single chip microcomputer system" area to s1-s8 port in the "dynamic digital display" area with 8-core flat cable（ 3) Connect P1.7 port in "single chip microcomputer system" area to SP1 port in "independent keyboard" area with wire; 4. Program design content (1). Dynamic scanning method the dynamic interface adopts the method of cyclic display of each nixie tube. When the cyclic display frequency is high, the flicker display phenomenon can not be seen by using the temporary characteristics of human eyes. This display requires one interface to complete the output of font code (font selection) and the other interface to complete the lighting of each nixie tube in turn (digital selection)（ 2) During digital display, 8 display buffers shall be opened for the display unit, and each display buffer shall be equipped with different displayed data（ 3) For the displayed font code data, we use the look-up table method. 5. Program block diagram 6. Assembly source program ORG 00h start: JB P1.7, dir1 mov dptr, #table1 sjmp dir: mov dptr, #table2 dir: mov R0, #00h mov R1, #01h next: mov a, R0 MOVC a, @ a + dptr mov P0, a mov a, R1 mov P2, a lcall day Inc R0 RL, a mov R1, a ne cjr1, #0dfh, Next sjmp start day: mov R6, #4 D1: mov R7, #248 djnz R7, $djnz R6, D1 RET table1: DB 06h, 5bh, 4fh, 66h, 6dh table2: DB 78h, 79h, 38h, 38h, 3fh end 7. C language source program #include unsigned char code table1 [] = {0x06,0x5b, 0x4f, 0x66,0x6d}; unsigned char code table2[]={0x78,0x79,0x38,0x38,0x3f}; unsigned char i; unsigned char a,b; unsigned char temp; void main(void) { while(1) { temp=0xfe; for(i=0; i<5; i++) { if(P1_ 7==1) { P0=table1[i]; } else { P0=table2[i]; } P2=temp; a=temp<<(i+1); b=temp>>(7-i); temp=a|b; for(a=4; a>0; a--) for(b=248; b>0; b--); } } }, Read the full text“

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