"LCD operation:
1602 LCD can only display ASCI. Today, the operation of 1602 LCD is simpler than that of nixie tube
Basic operation sequence of LCD:
1.1 read status: input: rs = L, RW = h, e = h, output d0 ~ D7
1.2 write instruction: input: rs = L, RW = L, d0 ~ D7 instruction code, e = high pulse, output: none;
RS is the data command selection terminal (H / L);
1.3 data reading: enter rs = h, RW = h, e = H
1.4 write command: output, rs = L, RW = L, d0 ~ D7 = data, e = high pulse
Note: before each read-write operation of the controller, read-write detection must be carried out to ensure that sta7 is 0, which can be replaced by a simple delay
Initialization settings
Display mode settings
Instruction code: 00111000 function, 16 * 2 display, 5 * 7 dot matrix, 8 is the instruction of data interface 0x38
Displays the setting of the on / off cursor
Therefore, shift left and right are set by N and s
Instruction code of data pointer
80h + address code (0-27h, 40H to 67h)
Other settings
The function of instruction code 01h is to clear the display: 1. Reset the data pointer, 2. Reset all displays
02h displays enter: 1. The data pointer is cleared
The circuit diagram is shown in the figure:
Example code: dynamic display
#include
#include
#define uchar unsigned char
#define uint unsigned int
sbit lcden = P2^6;// These ports should be connected with the hardware circuit first
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 terminal 0, low pulse write instruction, high pulse write data
_ nop_（）;// Postpone one machine cycle
lcdrw = 0;// Low level write data inside
P0= com;
delay（5）;
lcden = 1;// The enable terminal reads data to a high level
delay（5）;
lcden = 0;// Enable terminal gives a low level return
}
void write_ Date (uchar date) / / write data function
{
lcdrs = 1;// Enable terminal 0, low pulse write instruction, high pulse write data
_ nop_（）;// Postpone one machine cycle
lcdrw = 0;
P0= date;
delay（5）;
lcden = 1;
delay（5）;
lcden = 0;
}
void init（）
{
dula = 0;
wela = 0;// Turn off the nixie tube
lcden = 0;
write_ com（0x38）;// Display mode settings
write_ com（0x0e）;// Display switches 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;// Screen clearing operation
write_ com（0x80+0x53）;// Set data pointer
for（num=0; num《15; num++）
{
write_ date（table1［num］）;
delay（20）;
}
for（num = 0 ; num《16; num++）
{
write_ com（0x18）;// Shift the entire screen to the left
delay（20）;
}
while（1）;
}, read the full text, technical section
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