//实验板的AVR程序，驱动1602LCM(可显示2行，每行16个字符）模块显示实验练习。

//说明：RS高显示/低指令输入 RW高读/低写 EN高读数据/下降沿写数据

//具体电路可参照使用指南里的说明。每个字符为5×7或5×8的点阵，共16×2个字符。

//使用器件：ATMEGA8535，可更换。 使用默认的片内RC振荡器，1MHz。

//接线定义：PD4,5,6 为RS,R/W,EA。数据位为PC口。

//使用的开关：SW2-1,2,3.SW1-1,2,3,4,5,6,7,8.SW2-5为背光开关。 SW3-8为系统复位端。

-//Experimental board AVR programs, drivers 1602LCM (shows 2 lines, 16 characters per line) module shows that the experimental practice.// Descr iption: RS showed high/low command input high-RW Read/write EN high-low read data/write data on falling edge// specific reference circuit descr iption of the use of guides. Each character for the 5 × 7 or 5 × 8 lattice, a total of 16 × 2 characters.// Use the device: ATMEGA8535, can be replaced. Use the default-chip RC oscillator, 1MHz.// Connection definition: PD4, 5,6 for the RS, R/W, EA. Data bit for the PC port.// Use the switch: SW2-1, 2,3. SW1-1, 2,3,4,5,6,7,8. SW2-5 as a backlight switch. SW3-8 for the system reset terminal.