1、利用STC89C52单片机控制LCD1602利用STC89C52单片机控制LCD1602(不带中文字库)显示的中文一、设计原理使用STC89C52单片机控制1602LCD(不带中文字库的);利用1602LCD(不带中文字库的)中的存储器(64个字节00H-3FH)自建立8个58点阵的字符从而显示中文字符。二、LCD1602的指令集:1、清屏RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB00 0 0 0 0 0 0 0 0 1运行时间(250Khz):1.64ms;功能:清DDRAM和AC值。2、归位RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 D
2、B00 0 0 0 0 0 0 0 1 *运行时间(250Khz):1.64ms;功能:AC=0,光标、画面回HOME位。3、输入方式设置RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB00 0 0 0 0 0 0 1 I/D S运行时间(250Khz):40us;功能:设置光标、画面移动方式。其中:I/D=1:数据读、写操作后,AC自动增一;I/D=0:数据读、写操作后,AC自动减一; S=1:数据读、写操作,画面平移; S=0:数据读、写操作,画面不动;4、显示开关控制RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB00 0 0 0 0 0
3、1 D C B运行时间(250Khz):40us;功能:设置显示、光标及闪烁开、关。其中:D表示显示开关:D=1为开,D=0为关;C表示光标开关:C=1为开,C=0为关;B表示闪烁开关:B=1为开,B=0为关。5、光标、画面位移RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB00 0 0 0 0 1 S/C R/L * *运行时间(250Khz):40us;功能:光标、画面移动,不影响DDRAM。其中:S/C=1:画面平移一个字符位;S/C=0:光标平移一个字符位;R/L=1:右移;R/L=0:左移。 6、功能设置 RS R/WDB7 DB6 DB5 DB4 DB3 D
4、B2 DB1 DB00 0 0 0 1 DL N F * * 运行时间(250Khz):40us; 功能:工作方式设置(初始化指令)。 其中:DL=1,8位数据接口;DL=0,四位数据接口; N=1,两行显示;N=0,一行显示; F=1,510点阵字符;F=0,57点阵字符。7、CGRAM地址设置RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB00 0 0 1 A5 A4 A3 A2 A1 A0运行时间(250Khz):40us; 功能:设置CGRAM地址。A5A0=03FH。8、DDRAM地址设置RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB
5、00 0 1 A6 A5 A4 A3 A2 A1 A0运行时间(250Khz):40us;功能:设置DDRAM地址。 N=0,一行显示A6A0=04FH; N=1,两行显示,首行A6A0=00H2FH, 次行A6A0=40H67H。9、读BF及AC值RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB00 1BF AC6 AC5 AC4 AC3 AC2 AC1 AC0功能:读忙BF值和地址计数器AC值。其中:BF=1:忙;BF=0:准备好。此时,AC值意义为最近一次地址设置(CGRAM或DDRAM)定义。10、 写数据RS R/WDB7 DB6 DB5 DB4 DB3 DB
6、2 DB1 DB01 0数 据运行时间(250Khz):40us;功能:根据最近设置的地址性质,数据写入DDRAM或CGRAM内。11、读数据RS R/WDB7 DB6 DB5 DB4 DB3 DB2 DB1 DB01 1数 据运行时间(250Khz):40us;功能:根据最近设置的地址性质,从DDRRAM或CGRAM数据读出。三、程序:/液晶显示中文-版本0.0/作者:pcdian/定义液晶的一些功能位/RS 为数据、指令寄存器选择位/RW 为读写选择位/E 为使能位 RS BIT p2.5 RW BIT P2.6 E BIT P2.7 ORG 0000H SJMP START ORG 00
7、0BH LJMP Timer_IT ORG 0030HSTART:MOV SP,#60H MOV TMOD,#01H MOV TH0,#0A6H MOV TL0,#00H SETB EA SETB ET0 CLR TR0MAIN:MOV P0,#01H /清屏 ACALL ENABLE MOV P0,#38H /显示模式设置为16字*2行 ACALL ENABLE MOV P0,#0CH /不显示光标 ACALL ENABLE MOV P0,#06H /显示方向正向且屏不移动 ACALL ENABLEDISPLAY:ACALL DISPLAY_C0 /我 MOV P0,#80H ACALL E
8、NABLE MOV P0,#00H ACALL WRITE MOV P0,#81H ACALL ENABLE MOV P0,#01H ACALL WRITE MOV P0,#82H ACALL ENABLE MOV P0,#02H ACALL WRITE MOV P0,#0C0H ACALL ENABLE MOV P0,#03H ACALL WRITEMOV P0,#0C1H ACALL ENABLE MOV P0,#04H ACALL WRITEMOV P0,#0C2H ACALL ENABLE MOV P0,#05H ACALL WRITELCALL DELAY1S MOV P0,#01H
9、 ACALL ENABLEACALL DISPLAY_C1 /们 MOV P0,#83H ACALL ENABLE MOV P0,#00H ACALL WRITE MOV P0,#84H ACALL ENABLE MOV P0,#01H ACALL WRITE MOV P0,#85H ACALL ENABLE MOV P0,#02H ACALL WRITE MOV P0,#0C3H ACALL ENABLE MOV P0,#03H ACALL WRITEMOV P0,#0C4H ACALL ENABLE MOV P0,#04HACALL WRITEMOV P0,#0C5H ACALL ENAB
10、LE MOV P0,#05H ACALL WRITELCALL DELAY1S MOV P0,#01H ACALL ENABLEACALL DISPLAY_C2 /的 MOV P0,#86H ACALL ENABLE MOV P0,#00H ACALL WRITE MOV P0,#87H ACALL ENABLE MOV P0,#01H ACALL WRITE MOV P0,#88H ACALL ENABLE MOV P0,#02H ACALL WRITE MOV P0,#0C6H ACALL ENABLE MOV P0,#03H ACALL WRITE MOV P0,#0C7H ACALL
11、ENABLE MOV P0,#04H ACALL WRITE MOV P0,#0C8H ACALL ENABLE MOV P0,#05H ACALL WRITE LCALL DELAY1S MOV P0,#01H ACALL ENABLE ACALL DISPLAY_C3 /0 MOV P0,#89H ACALL ENABLE MOV P0,#00H ACALL WRITE MOV P0,#8AH ACALL ENABLE MOV P0,#01H ACALL WRITE MOV P0,#0C9H ACALL ENABLE MOV P0,#02H ACALL WRITE MOV P0,#0CAH
12、 ACALL ENABLE MOV P0,#03HACALL WRITE LCALL DELAY1S MOV P0,#01H ACALL ENABLEACALL DISPLAY_C4 /7 MOV P0,#8BH ACALL ENABLE MOV P0,#00H ACALL WRITE MOV P0,#8CH ACALL ENABLE MOV P0,#01H ACALL WRITE MOV P0,#0CBH ACALL ENABLE MOV P0,#02H ACALL WRITE MOV P0,#0CCH ACALL ENABLE MOV P0,#03H ACALL WRITE /3 MOV
13、P0,#8DH ACALL ENABLE MOV P0,#04H ACALL WRITE MOV P0,#8EH ACALL ENABLE MOV P0,#05H ACALL WRITE MOV P0,#0CDH ACALL ENABLE MOV P0,#06H ACALL WRITEMOV P0,#0CEH ACALL ENABLE MOV P0,#07HACALL WRITELCALL DELAY1S MOV P0,#01H ACALL ENABLE LJMP DISPLAYDISPLAY_C0:MOV DPTR,#TAB0 MOV R2,#48ACALL DISPLAY_C RETDIS
14、PLAY_C1:MOV DPTR,#TAB1 MOV R2,#48 ACALL DISPLAY_C RETDISPLAY_C2:MOV DPTR,#TAB2 MOV R2,#48ACALL DISPLAY_C RETDISPLAY_C3:MOV DPTR,#TAB3 MOV R2,#32 ACALL DISPLAY_C RETDISPLAY_C4:MOV DPTR,#TAB4 MOV R2,#64 ACALL DISPLAY_C RETDISPLAY_C:MOV P0,#40H ACALL ENABLE MOV R3,#0DISPLAY_CC:MOV A,R3 MOVC A,A+DPTR MO
15、V P0,A LCALL WRITE INC R3 DJNZ R2,DISPLAY_CC RETENABLE: CLR RS CLR RW CLR E ACALL DELAY SETB E RETWRITE: SETB RS CLR RW CLR E ACALL DELAY SETB E RETDELAY1S:SETB TR0CJNE R0,#20,DELAY1S CLR TR0MOV R0,#0 RETDELAY:MOV R5,#08H L1:MOV R4,#0FAH L0:DJNZ R4,L0 DJNZ R5,L1 RETTimer_IT:MOV TH0,#0A6H MOV TL0,#00
16、HINC R0RETITAB0: /我 DB 0x00,0x07,0x01,0x01,0x01,0x1F,0x01,0x01 DB 0x19,0x01,0x01,0x01,0x01,0x1F,0x01,0x01 DB 0x00,0x08,0x04,0x04,0x00,0x1F,0x00,0x04 DB 0x01,0x07,0x19,0x01,0x01,0x01,0x05,0x02 DB 0x18,0x00,0x00,0x01,0x06,0x00,0x00,0x00 DB 0x14,0x18,0x10,0x08,0x09,0x05,0x03,0x01TAB1: /们 DB 0x01,0x01,0
17、x02,0x02,0x06,0x04,0x0c,0x14 DB 0x08,0x04,0x06,0x04,0x10,0x10,0x10,0x10 DB 0x00,0x00,0x1e,0x02,0x02,0x02,0x02,0x02 DB 0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00 DB 0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x00 DB 0x02,0x02,0x02,0x02,0x02,0x0a,0x04,0x00TAB2: /的 DB 0x02,0x02,0x04,0x0f,0x08,0x08,0x08,0x0f DB 0x
18、02,0x02,0x02,0x13,0x14,0x14,0x18,0x12 DB 0x00,0x00,0x00,0x1e,0x02,0x02,0x02,0x02 DB 0x08,0x08,0x08,0x08,0x0f,0x08,0x08,0x00 DB 0x11,0x11,0x10,0x10,0x10,0x10,0x00,0x00 DB 0x02,0x12,0x12,0x02,0x02,0x14,0x08,0x00TAB3: /0 DB 0x00,0x00,0x03,0x04,0x08,0x08,0x08,0x08 DB 0x00,0x00,0x18,0x04,0x02,0x02,0x02,0
19、X02 DB 0x08,0x08,0x08,0x08,0x04,0x03,0x00,0x00 DB 0x02,0x02,0x02,0x02,0x04,0x18,0x00,0x00TAB4: /7 DB 0x00,0x00,0x0F,0x0F,0x00,0x00,0x00,0x00 DB 0x00,0x00,0x1E,0x1E,0x06,0x06,0x06,0X06 DB 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 DB 0x06,0x06,0x06,0x06,0x06,0x06,0x00,0x00 /3 DB 0x00,0x00,0x0F,0x0F,0x00,0x00,0x00,0x0F DB 0x00,0x00,0x1E,0x1E,0x06,0x06,0x06,0X1E DB 0x0F,0x00,0x00,0x00,0x0F,0x0F,0x00,0x00 DB 0x1E,0x06,0x06,0x06,0x1E,0x1E,0x00,0x00 END 四、总结: 虽然LCD1602可以利用自建字符显示中文,但最多不能超过8个字符位。所以实际应用中,无法同时显示“我们的073”。该段程序没来得及优化,没有充分利用单片机做重复的事情的优点;并且使代码量增大,可读较差(重复的,看起来头晕);注释少也致使可读性差!
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