查询 HD7279 供应商捷多邦, 专业 PCB 打样工厂,24 小时加急出货是一片具有串行接口的可同时驱动位共阴式数码管或只独立的智能显示驱动芯片该芯片同时还可连接多达键的键盘矩阵单片即可完成显示键盘接口的全部功能内部含有译码器可直接接受码或进制码并同时具有种译码方式参见后

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1 查询 HD7279 供应商捷多邦, 专业 PCB 打样工厂,24 小时加急出货是一片具有串行接口的可同时驱动位共阴式数码管或只独立的智能显示驱动芯片该芯片同时还可连接多达键的键盘矩阵单片即可完成显示键盘接口的全部功能内部含有译码器可直接接受码或进制码并同时具有种译码方式参见后文此外还具有多种控制指令如消隐闪烁左移右移段寻址等具有片选信号可方便地实现多于位的显示或多于键的键盘接口 ) ) ( ' & % $ # "!! "#! $#%& '()*+%&,-../ ( 789:;<=>?

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12 #Y0?µ $5iRSYz>Ãœ ëvp4.o() ThiNfY.O ÉU#SÛT C œ1hîyàáª«!#"$5 Ž#!i 1žpV.0 $5 1)23452ÔÈ, ò ƒjò~ $5J 112ØY# V "œ Y/ 1žp"œY Õ ƒ 112 $ title (HD7279A Test Program) $ DB ;********************************* ; RAMäå ;********************************* BIT_COUNT DATA 07FH TIMER DATA 07EH TIMER1 DATA 07DH TEN DATA 07CH DATA_IN DATA 020H DATA_OUT DATA 021H! ; I/O"äå DAT BIT P1.2 ;HD7279AYDATAŽ# P1.2 KEY BIT P1.3 ;HD7279AYKEYŽ# P1.3 CS BIT P1.4 ;HD7279AYCSŽ# P1.4 CLK BIT P1.5 ;HD7279AYCLKŽ# P1.5 ORG JMP 000H START ORG 100H START: MOV SP,#2FH ;äå MOV P1,# B ;I/O"ˆ Š MOV TIMER,#50 ; 1i25MS

13 START_DELAY: MOV TIMER1,#255 START_DELAY1:DJNZ TIMER1,START_DELAY1 DJNZ TIMER,START_DELAY MOV DATA_OUT,# B ; a( bc) DE CALL SEND SETB CS ; 3aCSV*+ MAIN: JB KEY,MAIN ; àæ`.-< MOV DATA_OUT,# B ;`.-< CN.ODE CALL SEND CALL RECEIVE SETB CS ; jcsv*+ MOV B,#10 ;16Û BCDÉU# MOV A,DATA_IN DIV AB MOV TEN,A MOV DATA_OUT,# B ; 2ª«DE dî CALL SEND ; ÀÁª«, þ9 Z ;L ; CDEfHD7279A MOV DATA_OUT,# B CALL SEND MOV DATA_OUT,# B ; <ÅLÆÈÉDE ( 2 ) CALL SEND MOV DATA_OUT,TEN ; CÜHfHD7279A CALL SEND MOV DATA_OUT,# B ; <ÅLÆÈÉDE ( 1 ; ) CALL SEND MOV DATA_OUT,B ; C HfHD7279A CALL SEND SETB CS WAIT: JNB KEY,WAIT ;p4-. ç JMP MAIN ; C 1 HIf HD7279 * Î SEND: MOV BIT_COUNT,#8 ; jäœ=8 CLR CS ; jcsv,+ CALL LONG_DELAY ;r 1

14 SEND_LOOP: MOV C,DATA_OUT.7 ;(91 MOV DAT,C SETB CLK ; jclkv*+ MOV A,DATA_OUT ;4 CLª«RL A MOV DATA_OUT,A CALL SHORT_DELAY ;h 1 CLR CLK ; jclkv,+ CALL SHORT_DELAY ;h 1 DJNZ BIT_COUNT,SEND_LOOP ; _àæ8ë CR CLR DAT ; CR RET ; ; HD7279#eu HI * Î RECEIVE: MOV BIT_COUNT,#8 ; jäœ=8 SETB DAT ; j P1.2(DATA) "V*+ ;(()WX) CALL LONG_DELAY ;r 1 RECEIVE_LOOP: SETB CLK ; kclkv*+ CALL SHORT_DELAY ;h 1 MOV A,DATA_IN ;Lª«RL A MOV DATA_IN,A MOV C,DAT ;N ul MOV DATA_IN.0,C CLR CLK ; kclkv,+ CALL SHORT_DELAY DJNZ BIT_COUNT,RECEIVE_LOOP; àæž#e8l CLR DAT ; ÿj DAT "V,+((9WX) RET ; 1 $5 LONG_DELAY: MOV TIMER,#25 ; jä 112Vi50uS DELAY_LOOP: DJNZ TIMER,DELAY_LOOP RET SHORT_DELAY: MOV TIMER,#4 ; jä 112Vi8uS SHORT_LP: DJNZ TIMER,SHORT_LP

15 RET END #"$5 Ž# i 1žp.0 $5. xyy.. ÔÈ$5ÔÈ,ò ƒjò~ $5J 112ØY# V "œy/ 1žp Õ ƒ 112 TITLE LIST INCLUDE "HD7279A TEST" P=16C54 P16C5X.INC ;********************************** ; 01äå ;********************************** BIT_COUNT SET 0X07 DATA_OUT SET 0X08 DATA_IN SET 0X09 TEN SET 0X0A TIMER SET 0X0B TIMER1 SET 0X0C ;********************************** ; I/O"äå ;********************************** CS EQU 0 ;CSŽ# 16C54YRA0 CLK EQU 1 ;CLKŽ# 16C65YRA1 DAT EQU 2 ;DATŽ# 16C54YRA2 KEY EQU 3 ;KEYŽ# 16C54YRA3 ORG GOTO 0x1FF START ORG 0X00 ; 1 $5 LONG_DELAY MOVLW D'16' ; jä 112Vi50uS MOVWF TIMER

16 DELAY_LOOP DECFSZ TIMER GOTO DELAY_LOOP RETLW 0 SHORT_DELAY MOVLW D3 ; jä 112Vi8uS MOVWF TIMER SHORT_LP DECFSZ TIMER GOTO SHORT_LP RETLW 0 ; C 1 HIf HD7279 * Î SEND MOVWF DATA_OUT ; 4 CL1) DATA_OUT MOVLW D'8' MOVWF BIT_COUNT ; jäœ=8 BCF PORTA,CS ; jcsv,+ CALL LONG_DELAY ;r 1 SEND_LOOP BCF STATUS,C RLF DATA_OUT ;(91 BCF PORTA,DAT BTFSC STATUS,C BSF PORTA,DAT BSF PORTA,CLK ; jclkv*+ CALL SHORT_DELAY ;h 1 BCF PORTA,CLK ; jclkv,+ CALL SHORT_DELAY DECFSZ BIT_COUNT ; _àæ8ë CR GOTO SEND_LOOP ; CR C<u BCF PORTA,DAT RETLW 0 ; CR ; ; HD7279#eu HI * Î RECEIVE MOVLW D'8' MOVWF BIT_COUNT ; jäœ=8 MOVLW B' ' ; j RA2(DATA) "V()WX TRIS PORTA CALL LONG_DELAY ;r 1 RECEIVE_LOOP BSF PORTA,CLK ; kclkv*+ CALL SHORT_DELAY ;h 1

17 BSF BTFSS BCF STATUS,C PORTA,DAT STATUS,C RLF DATA_IN ;N ul BCF PORTA,CLK ; kclkv,+ CALL SHORT_DELAY DECFSZ BIT_COUNT ; àæž#e8l GOTO RECEIVE_LOOP MOVLW B' ' ; ÿj RA2(DATA) "V(9X TRIS PORTA RETLW 0 ; ˆ Š START MOVLW B' ' ;I/O"ˆ Š TRIS PORTA MOVLW B' ' MOVWF PORTA MOVLW 0X19 ; 1i25MS MOVWF TIMER START_DELAY MOVLW 0XFF MOVWF TIMER1 START_DELAY1 DECFSZ TIMER1 GOTO START_DELAY1 DECFSZ TIMER GOTO START_DELAY MOVLW B' ' ; a( bc) DE CALL SEND BSF PORTA,CS ; 3aCSV*+ ; $5 MAIN BTFSC PORTA,KEY ; àæ`.-< GOTO MAIN MOVLW B' ' ;`.-< CN.ODE CALL SEND ; CN.ODE CALL RECEIVE ;; HD7279AN.OÉ BSF PORTA,CS ; jcsv*+

18 ; 16Û BCDÉU# CLRF TEN GET_DEC MOVLW D'10' SUBWF DATA_IN,W SKPC GOTO OVER MOVWF DATA_IN INCF TEN GOTO GET_DEC ; C-.YBCDÉfHD7279 ; 2ª«DE dîàáª«;þ9 ZL OVER MOVLW B' ' ;ª«DE CALL SEND ; CDEfHD7279A MOVLW B' ' ;ª«DE CALL SEND ; CDEfHD7279A MOVLW B' ' ; <ÅLÆÈÉDE ( 2 ) CALL SEND ; CDEfHD7279A MOVFW TEN CALL SEND ; CÜHfHD7279A MOVLW B' ' ; <ÅLÆÈÉDE ( 1 ) CALL SEND ; CDEfHD7279A MOVFW DATA_IN CALL SEND ; C HfHD7279A BSF PORTA,CS WAIT BTFSS PORTA,KEY ;p4-. ç GOTO WAIT GOTO MAIN END

19 u: MCS51Y C µ $5 ôà HD7279A Y C51 $5, C Ô$Y Ø #include <reg51.h> //*** äå *** void long_delay(void); // r 1 void short_delay(void); // hš 1 void delay10ms(unsigned char); // 110MS void write7279(unsigned char, unsigned char);// ù)fhd7279 unsigned char read7279(unsigned char);// ; HD7279N9 void send_byte(unsigned char); // Cu HI unsigned char receive_byte(void); // #eu HI //*** eš I/O "äå *** unsigned char digit[5]; unsigned char key_number, j, k; unsigned int tmr; unsigned long wait_cnter; sbit cs=p1^4; // cs at P1.4 sbit clk=p1^5; // clk Ž# P1.5 sbit dat=p1^2; // dat Ž# P1.2 sbit key=p1^3; // key Ž# P1.3 //****** HD7279A DE ****** #define CMD_RESET 0xa4 #define CMD_TEST 0xbf #define DECODE0 0x80 #define DECODE1 0xc8 #define CMD_READ 0x15 #define UNDECODE 0x90 #define RTL_CYCLE 0xa3 #define RTR_CYCLE 0xa2 #define RTL_UNCYL 0xa1 #define RTR_UNCYL 0xa0 #define ACTCTL 0x98 #define SEGON 0xe0 #define SEGOFF 0xc0 #define BLINKCTL 0x88 //*** $5 *** main()

20 while (1) for (tmr=0;tmr<0x2000;tmr++); // ~ 1 send_byte(cmd_reset); // ahd7279a //****************************************** // DE //****************************************** send_byte(cmd_test); // DE for (j=0;j<3;j++) // 1i3œ delay10ms(100); send_byte(cmd_reset); // bc //********************************************** // nodeš.o#" // h -.Y.É9, ) 10œÀ -. // - S0.Û)<u //********************************************** wait_cnter=0; key_number=0xff; write7279(blinkctl,0xfc); // 1 2 jvno write7279(undecode,0x08); // 1 <ž= '_' write7279(undecode+1,0x08);// 2 <ž= '_' do if (!key) // )`.-< key_number=read7279(cmd_read); // N9.É write7279(decode1+1,key_number/16); // 2.É* 8 write7279(decode1,key_number&0x0f); // 1.É, 8 while (!key); // p4-. ç wait_cnter=0; wait_cnter++; while (key_number!=0 && wait_cnter<0x30000); // )-.V 0 ^M1ÚÛ)<u

21 write7279(blinkctl,0xff); // bcnojk //****************************************** // Ÿ //****************************************** for (j=0;j<5;j++) // ˆ ûv00000 digit[j]=0; write7279(decode0+j,digit[j]); while (digit[4]<2) // ) f digit[0]++; if (digit[0]>9) digit[0]=0; digit[1]++; if (digit[1]>9) digit[1]=0; digit[2]++; if (digit[2]>9) digit[2]=0; digit[3]++; if (digit[3]>9) digit[3]=0; digit[4]++; if (digit[4]>9) digit[4]=0; write7279(decode0,digit[0]); if (digit[0]==0) write7279(decode0+1,digit[1]);

22 if (digit[1]==0) write7279(decode0+2,digit[2]); if (digit[2]==0) write7279(decode0+3,digit[3]); if (digit[3]==0) write7279(decode0+4,digit[4]); delay10ms(150); send_byte(cmd_reset); // bc //************************************************* // <ÅL±"ÈÉDE //************************************************* write7279(undecode+7,0x49); // 8 -"ÈÉÂÇuH' 2' delay10ms(80); //************************************************* // ½¾ª / «// " 2" H 63, ª 63 //************************************************* for (j=0;j<23;j++) send_byte(rtr_cycle); // ½¾ «23 delay10ms(12); for (j=0;j<23;j++) send_byte(rtl_cycle); // ½¾ª«23 delay10ms(12); //********************************************* // ÈÉÂÇ0šª«DE

23 //********************************************* for (j=0;j<16;j++) send_byte(rtl_uncyl); // write7279(decode0,j); // ÈÉÂÇ0DE 1 delay10ms(50); delay10ms(150); send_byte(cmd_reset); "½¾ª«DE //********************************************* // ÈÉÂÇ1š «DE //********************************************* for (j=0;j<16;j++) send_byte(rtr_uncyl); // write7279(decode1+7,j); // ÈÉÂÇ0DE 8 delay10ms(50); delay10ms(150); "½¾ª«DE //********************************************* // lmde //********************************************* k=0xff; for (j=0;j<6;j++) k=k/2; write7279(actctl,k);// Muœžªu lm delay10ms(100); write7279(actctl,0xff); // 3a8 delay10ms(100); send_byte(cmd_reset); // bc //********************************************** // %DE^ DE //********************************************** for (j=0;j<64;j++)

24 write7279(segon,j); // h 64 «% write7279(segoff,j-1); // œ1hîu delay10ms(20); void write7279(unsigned char cmd, unsigned char dta) send_byte (cmd); send_byte (dta); unsigned char read7279(unsigned char command) send_byte(command); return(receive_byte()); void send_byte( unsigned char out_byte) unsigned char i; cs=0; long_delay(); for (i=0;i<8;i++) if (out_byte&0x80) dat=1; else dat=0; clk=1; short_delay(); clk=0; short_delay(); out_byte=out_byte*2;

25 dat=0; unsigned char receive_byte(void) unsigned char i, in_byte; dat=1; // jv()wx long_delay(); for (i=0;i<8;i++) clk=1; short_delay(); in_byte=in_byte*2; if (dat) in_byte=in_byte 0x01; clk=0; short_delay(); dat=0; return (in_byte); void long_delay(void) unsigned char i; for (i=0;i<0x30;i++); void short_delay(void) unsigned char i; for (i=0;i<8;i++); // ********************* 1 n*10ms ********************** void delay10ms(unsigned char time) unsigned char i; unsigned int j;

26 for (i=0;i<time;i++) for(j=0;j<0x390;j++) if (!key) key_int();

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