Single chip drive for 1602 LCD

LCD operation: 1602 LCD can only display ASCI, today drive 1602 LCD, the liquid crystal operation is simpler than the digital tube The basic operation timing of the liquid crystal: 1.1 Reading status: Enter: rs = L, RW = H, E = H Output D0 ~ D7 1.2 Write instruction: Enter: rs = L, RW = L, D0 ~ D7 instruction code, E = high pulse, output: None; RS is the data command selection (h / L); 1.3 Read Data: Enter rs = H, RW = H, E = H 1.4 write instruction: output, RS = L, RW = L, D0 ~ D7 = data, E = high pulse Note: Read and write detection must be performed before the controller is read and write each time, ensure that STA7 is 0, can be replaced with a simple delay. Initialization setting Display mode settings Communication code: 00111000 function 16 * 2 display, 5 * 7 o'clock, 8 is instructions for data interface 0x38 Display the setting of on / off Therefore, left shift and right by n and s Data pointer instruction code 80h + address code (0-27h, 40h to 67h) other settings The instruction code 01H function is a display clear screen: 1 data pointer is clear, 2 all display clear 02H Show Enter: 1 Data Pointer Clear The circuit diagram is shown in the figure: Sample code: Dynamic display #include #include #define uchar unsigned char #define uint unsigned int SBIT LCDEN = P2 ^ 6; // These ports should be in contact with the hardware circuit SBIT LCDRW = P2 ^ 5; SBIT LCDRS = P2 ^ 4; SBIT DULA = P3 ^ 1; SBIT WELA = P3 ^ 2; Uchar NUM; Uchar code Table [] = "i like mcu!"; Uchar code Table1 [] = "i like huleihao"; Void delay (uint z) { UINT X, Y; For (x = z; x>0; x -) FOR (Y = 110; Y>0; Y -); } Void Write_com (uchar COM) // Write Command Function { LCDRS = 0; // Enable end 0 low pulse instructions, high pulse write data _nop _(); // Postpone a machine cycle LCDRW = 0; // low electricity to write data P0 = COM; DELAY (5); LcDen = 1; // Enable end to a high-level reading data DELAY (5); LcDEN = 0; // Enable end to a low level } Void write_date (uchar Date) // write data function { LCDRS = 1; // Enable end 0 low pulse instructions, high pulse data _nop _(); // Postpone a machine cycle LCDRW = 0; P0 = DATE; DELAY (5); LcDEN = 1; DELAY (5); LcDEN = 0; } void init () { DULA = 0; WELA = 0; // Turn off Digital Tube LcDEN = 0; WRITE_COM (0x38); // Display mode settings Write_com (0x0e); // Display Switch and Cursor Settings WRITE_COM (0x06); WRITE_COM (0x80 + 0x10); } void main () { INIT (); For (NUM = 0; Num<11; Num ++) { Write_date (Table [NUM]); DELAY (20); } // Write_com = 1; // Clean screen operation Write_com (0x80 + 0x53); // Setting data pointer For (NUM = 0; Num<15; Num ++) { Write_date (Table1 [Num]); DELAY (20); } For (NUM = 0; Num<16; Num ++) { Write_com (0x18); // The whole screen is left DELAY (20); } While (1); } Source; 21IC, read full text

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