STC micro STC8A8K64D4 Series - UART4 Using T2 as Baud Rate Generator

STC8A8K64D4 Series Manual
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14.8.7 UART4 using T2 as baud rate generator
C language code
//Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
#define FOSC 11059200UL
#define BRT (65536 - FOSC / 115200 / 4)
sfr AUXR = 0x8e;
sfr T2H = 0xd6;
sfr T2L = 0xd7;
sfr S4CON = 0x84;
sfr S4BUF = 0x85;
sfr IE2 = 0xaf;
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;
bit busy;
char wptr;
char rptr;
char buffer[16];
void Uart4Isr() interrupt 18
{
if (S4CON & 0x02)
{
S4CON &= ~0x02;
busy = 0;
}
if (S4CON & 0x01)
{
S4CON &= ~0x01;
buffer[wptr++] = S4BUF;
wptr &= 0x0f;
}
}
void Uart4Init()
{
S4CON = 0x10;
T2L = BRT;
T2H = BRT >> 8;
AUXR = 0x14;