/**********************51引腳定義************************/
//看門狗
sbit wdi=P1^5;

//外部ROM
sbit rom_wr=P3^6;
sbit rom_rd=P3^7;
sbit rom_ce=P1^2;
sbit rom_a17=P1^1;
sbit rom_a16=P1^0;

//與CPU2相連
sbit pin_wrram=P1^7;
sbit pin_full=P1^6;

//外部RAM
sbit ram_wr=P3^6;
sbit ram_rd=P3^7;
sbit ram_ce=P3^5;

//語音芯片ISD25xx引腳定義
sbit isd_ce = P3^3;
sbit isd_a9 = P1^1;
sbit isd_a8 = P1^0;