typedef unsigned char uchar;
typedef unsigned int uint;


sbit ONTEL=P3^0;

sbit CSE=P2^7;
sbit RSE=P2^0;
sbit WRE=P3^6;
sbit RDE=P3^7;
sbit INT=P3^2;


void main(void);
void init(void);
void delayms(uint n);

uchar readsr(void);
void writesr(uchar a);
uchar readdata(void);
void writedata(uchar a);
void mode_cp(void);
void mode_DTMFOUT(void);
void mode_DTMFIN(void);