定时器3作为串口0，1的波特率发生器

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uptown|

楼主 | 2025-1-11 10:40 | 只看该作者回帖奖励

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串口, 发生器, 定时, 定时器, 波特率发生器

定时器3串口0模式3代码实现：

P06_Quasi_Mode;
P07_Quasi_Mode;

SCON = 0xD0;    //UART0 Mode3,REN=1,TI=1
set_SMOD;       //UART0 Double Rate Enable
T3CON = 0xF8; //T3PS2=0,T3PS1=0,T3PS0=0(Prescale=1)
set_BRCK;       //UART0 baud rate clock source = Timer3
#ifdef  FOSC_240000
RH3 = HIBYTE(65536 - (1500000/u32Baudrate));
RL3 = LOBYTE(65536 - (1500000/u32Baudrate));
#endif
set_TR3;       //Trigger Timer3
set_RB8; //This bit is for setting the stop bit 2 high/low status,
TI = 0;

set_ES;          //enable UART interrupt
set_EA;          //enable global interrupt
定时器3串口1模式3代码实现：

P02_Quasi_Mode;
P16_Quasi_Mode;

SCON_1 = 0xD2;    //UART1 Mode3,REN=1,TI=1
set_SMOD_1;       //UART1 Double Rate Enable
T3CON = 0xF8; //T3PS2=0,T3PS1=0,T3PS0=0(Prescale=1)
set_BRCK;       //UART1 baud rate clock source = Timer3
#ifdef FOSC_160000
RH3 = HIBYTE(65536 - (1000000/u32Baudrate));
RL3 = LOBYTE(65536 - (1000000/u32Baudrate));
#endif
#ifdef FOSC_240000
RH3 = HIBYTE(65536 - (1500000/u32Baudrate));
RL3 = LOBYTE(65536 - (1500000/u32Baudrate));
#endif
set_TR3;       //Trigger Timer3
set_RB8_1; //This bit is for setting the stop bit 2 high/low status,
TI_1 = 1;

set_ES_1;          //enable UART interrupt
set_EA;          //enable global interrupt

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