STC micro STC8A8K64D4 Series - Timer 4 Is Used as Baud Rate Generator of UART4

STC8A8K64D4 Series Manual
- 367 -
MOV P2M1, #00H
MOV P3M0, #00H
MOV P3M1, #00H
MOV P4M0, #00H
MOV P4M1, #00H
MOV P5M0, #00H
MOV P5M1, #00H
MOV T4L,#66H ;65536-11.0592M/12/1000
MOV T4H,#0FCH
MOV T4T3M,#90H ;Enable clock output and start timer
JMP $
END
13.5.30 Timer 4 is used as baud rate generator of UART4
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 T4T3M = 0xd1;
sfr T4L = 0xd3;
sfr T4H = 0xd2;
sfr T3L = 0xd5;
sfr T3H = 0xd4;
sfr T2L = 0xd7;
sfr T2H = 0xd6;
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];