您的位置：首页 → 单片机 → 义隆单片机
内容搜索：
阅读内容
背景：#EDF0F5 #FAFBE6 #FFF2E2 #FDE6E0 #F3FFE1 #DAFAF3 #EAEAEF 默认  

EM78系列单片机--HT1621液晶LCD显示驱动程序

[日期:2008-07-01 ] [来源:东哥单片机学习网 www.picavr.com 整理 作者:佚名] [字体：大 中 小]  (投递新闻)
1．LCD驱动器1621

HT1621为128（32×4）段LCD驱动器。它可设置为1/2或1/3偏置且通过S/W配置设置为2，3或4个共用的LCD驱动器。这使得HT1621适于多LCD应用。LCD驱动时钟
图5.6  HT1621功能框图
从系统时钟内产生，一般为256KHZ。图5.6为HT1621功能框图
2．EM78X56与HT1621接口
EM78X56与HT1621接口只须四条线。CS线用以初始化串行接口电路且终止EM78X56与HT1621的通信。若CS=1，EM78X56及HT1621间发送的命令首先被禁止即而进行初始化。在模式命令或模式转换发出前，需要一高电平脉冲以初始化HT1621的串行接口，数据的读/写及命令的写人必须通过数据线。RD为输入，RAM内的数据在RD信号的下降沿同步送出至数据线上。这使EM78X56可以在RD信号的升沿及下一个下降沿到来期间读人正确的数据。WR为写输入，数据线上的数据、地址及命令将在WR信号上升写入HT1621。一条可选择的IRQ线也可用作EM78X56及HT1621间的接口。
1.    
读／写命令时序控制及命令集
 
 

 
 
Command Code
D/C
Function
READ
110
a5 a4 a3 a2 a1 a0 d0 d1 d2 d3
D
Read data in the RAM
WRITE
101
a5 a4 a3 a2 a1 a0 d0 d1 d2 d3
D
Write data to the RAM
READ
MODIFY
WRITE
101
a5 a4 a3 a2 a1 a0 d0 d1 d2 d3
D
READ and WRITE to RAM
SYS DIS
100000000000X
C
Turn off bth system oscillator
And LCD blas generator
SYS EN
100000000001X
C
Turn on system oscillator
LCD OFF
100000000010X
C
Turn off LCD blas generator
LCD ON
100000000011X
C
Turn on LCD bias generator
XTAL 32K
1000000101XXX
C
System clock source,crystal
oscillator
BIAS  1/2
1000010abX0X
C
LCD 1/2 bias sption
ab=00:2 commons option
ab=01:3 commons option
ab=10:4 commons option
BIAS  1/3
1000010abX1X
C
LCD 1/2 bias sption
ab=00:2 commons option
ab=01:3 commons option
ab=10:4 commons option
 
4. 应用电路
图 5.7 HT1621应用框图
 
5. 编程示例

                R1      EQU     0X01
                R2      EQU     0X02
                R3      EQU     0X03
                IOC5    EQU     0X05
                IOC6    EQU     0X06
                PORT5   EQU     0X05
                PORT6   EQU     0X06
                IOCB    EQU     0X0B
                IOCC    EQU     0X0C
                IOCD    EQU     0X0D
                IOCE    EQU     0X0E
                IOCF    EQU     0X0F
                S1      EQU     0X10
                S2      EQU     0X11
                S3      EQU     0X12
                S4      EQU     0X13
                S5      EQU     0X14
                S6      EQU     0X15
                S7      EQU     0X16
                S8      EQU     0X17
                S8S7    EQU     0X18
                S9      EQU     0X19
                S10     EQU     0X1A
                COMMAND EQU     0X1B
                R_LOOP  EQU     0X1C
                S_LOOP  EQU     0X1D
                SEG0    EQU     0X1E
                SEG1    EQU     0X1F
                SEG2    EQU     0X20
                SEG3    EQU     0X21
                SEG4    EQU     0X22
                SEG5    EQU     0X23
                SEG6    EQU     0X24
                SEG7    EQU     0X25
                SEG8    EQU     0X26
                SEG9    EQU     0X27
                SEG10   EQU     0X28
                LCD_MAP EQU     0X29
                LCDRAM  EQU     0X2A
                KEY2    EQU     0X2B
                KEY7    EQU     0X2C
                KEY_SX  EQU     0X2D
                LP_CNT0 EQU     0X2E
                LP_CNT1 EQU     0X2F

                ORG     0X000
                JMP     MAIN
                NOP
MAIN:           CLRA                    ;P50-P53 SET TO OUTPUT
                IOW     IOC5
                IOW     IOCE
                MOV     A,@0B11110000   ;P60-P63 SET TO OUTPUT
                IOW     IOC6            ;P64-P67 SET TO INPUT
                MOV     A,@0X0F
                MOV     PORT5,A         ;P50-P53 RESET TO 1
                CLR     PORT6           ;P60-P63 RESET TO 0
                BC      PORT5,0         ;RESET 1621 INTERFACE
                BS      PORT5,0
                BC      PORT5,0
                BS      PORT5,0         ;P50 SET TO 1,/CS=1
                MOV     A,@0B11100011   ;COMMAND TNORMAL
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B10000000   ;COMMAND /IRQ DIS
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00010100   ;COMMAND XTAL32K
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00101001   ;COMMAND BIAS1/3,4 COM
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00001000   ;COMMAND TONE OFF
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00000101   ;COMMAND WDT DIS
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00000100   ;COMMAND TIMER DIS
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00000001   ;COMMAND SYS_EN
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0B00000011   ;COMMAND LCD_ON
                MOV     COMMAND,A
                CALL    C_WRITE
                MOV     A,@0X0FF        ;LCD MAP SET TO 1
                MOV     SEG0,A
                MOV     SEG2,A
                MOV     SEG3,A
                MOV     SEG4,A
                MOV     SEG5,A
                MOV     SEG6,A
                MOV     SEG7,A
                MOV     SEG8,A
                MOV     SEG9,A
                MOV     SEG10,A
                CLR     LCD_MAP         ;FIRST MAP ADD IS 0
                CALL    LCD_WRITE       ;DISPLAY ALL SEGS
(BREAK):
 
 
LCD_OFF:        CLR     COMMAND         ;TURN OFF LCD SYSTEM
                CALL    C_WRITE            
 
 
C_WRITE:        MOV     A,@0X08
                MOV     R_LOOP,A
                BS      PORT5,2         ;/WR=1
                BC      PORT5,0         ;/CS=0
                BC      PORT5,2         ;/WR=0
                BS      PORT5,3         ;DATA=1
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                BC      PORT5,3         ;DATA=0
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                BC      PORT5,3         ;DATA=0
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
C8_C1_WRITE:    JBC     COMMAND,7       ;COMMAND,7=0
                JMP     SET_DATA_1
                BC      PORT5,3         ;DATA=0
                JMP     NEXT_1
SET_DATA_1:     BS      PORT5,3         ;DATA=1
NEXT_1:         RLC     COMMAND
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                DJZ     R_LOOP
                JMP     C8_C1_WRITE
                BC      PORT5,3         ;DATA=0
                BS      PORT5,2         ;/WR=1
                BS      PORT5,0         ;/CS=1
                RET
LCD_WRITE:      BS      PORT5,2         ;/WR=1
                BC      PORT5,0         ;/CS=0
                BC      PORT5,2         ;/WR=0
                BS      PORT5,3         ;DATA=1
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                BC      PORT5,3         ;DATA=0
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                BS      PORT5,3         ;DATA=1
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                                        ;WRITE THE LCD MEMORY ADD 00
                BC      PORT5,3         ;DATA=0, 1 
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                                        ;DATA=0, 2
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                                        ;DATA=0, 3
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                                        ;DATA=0, 4
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                                        ;DATA=0, 5
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                                        ;DATA=0, 6
                BS      PORT5,2         ;/WR=1               
                MOV     A,SEG0
                MOV     LCDRAM,A        ;SEG0
                CALL    LCDDATA_W
                MOV     A,SEG1
                MOV     LCDRAM,A        ;SEG1
                CALL    LCDDATA_W
                MOV     A,SEG2
                MOV     LCDRAM,A        ;SEG2
                CALL    LCDDATA_W
                MOV     A,SEG3
                MOV     LCDRAM,A        ;SEG3
                CALL    LCDDATA_W
                MOV     A,SEG4
                MOV     LCDRAM,A        ;SEG4
                CALL    LCDDATA_W
                MOV     A,SEG5
                MOV     LCDRAM,A        ;SEG5
                CALL    LCDDATA_W
                MOV     A,SEG6
                MOV     LCDRAM,A        ;SEG6
                CALL    LCDDATA_W
                MOV     A,SEG7
                MOV     LCDRAM,A        ;SEG7
                CALL    LCDDATA_W
                MOV     A,SEG8
                MOV     LCDRAM,A        ;SEG8
                CALL    LCDDATA_W
                MOV     A,SEG9
                MOV     LCDRAM,A        ;SEG9
                CALL    LCDDATA_W
                MOV     A,SEG10
                MOV     LCDRAM,A        ;SEG10
                CALL    LCDDATA_W
                BS      PORT5,0         ;/CS=1
                RET
              
LCDDATA_W:      MOV     A,@0X04         ;RAM DATA WRITE
                MOV     R_LOOP,A
DATA_W          JBC     LCDRAM,0
                JMP     RAM_SET
                BC      PORT5,3         ;DATA=0
                JMP     NEXT_3
RAM_SET:        BS      PORT5,3         ;DATA=1
NEXT_3:         RRC     LCDRAM
                BS      PORT5,2         ;/WR=1
                BC      PORT5,2         ;/WR=0
                DJZ     R_LOOP
                JMP     DATA_W
                RET
 
                EOP
阅读： 次
录入：JETTA

【 推荐 】 【 打印 】
本站热卖产品
本文评论
      全部评论
发表评论


点评： 字数
姓名：
站长推荐
本站热卖产品
本周热门内容