ACM-12864汉字液晶显示驱动程序 sbit p_csa=P2^6; sbit p_csb=P2^7; sbit p_gnda=P2^5; sbit p_gndb=P2^4; sbit p_di=P2^3; sbit p_rw=P2^2; sbit p_e=P2^1;