[Turn]51 single-chip microcomputer 11.0592MHz generated 115200 baud rate

Connection: http://homezzy.blog.hexun.com/29601793_d.htmltoday solved a small problem (check the book before you get the exact conclusion ...) ) with 51 single-chip microcomputer+ One. 0592 Crystal Oscillator, how to generate 115200 baud rate? Originally felt this meaning, direct initialization timer 1, the program is as follows:voidInit_com (void) {SCON=0x50;//serial port operating mode 1, 8-bit UART, baud rate variableTmod |=0x20;//Timer 1, working mode 2, automatically reload 8-bit timerPCON |=0x80;//smod=1; double the baud rate.TH1 =0XFA;//baud rate: 9600 crystal oscillator =11.0592mhzIE |=0x90;//enable the serial port to interruptTR1 =1;//Timer 1 Startthe results found that this can only get 9600 baud rate ... When Smod=1, k=2, the baud rate doubles, the formula is: Baud rate=kx11059200/ +X AX ( the-TH1) So, TH1=0XFA= the-（2X11059200/384x baud rate) where the baud rate is 9600 at this time, timely make TH1=0xFF, the maximum baud rate can only be 57600, that is, this can not get 115200 baud rate ... This is the only way to use the other methods:1, crystal oscillator, with 22.1184M crystal oscillator, in th1=at 0xFF, a 115200 baud rate can be generated. 2, the use of 6 clock cycle of single-chip microcomputer (SCM AH ... )3, enhanced 51 single-chip microcomputer has timer 2! (Fortunately, I use the enhanced type ...) It's a third way! At this point the formula is as follows: Baud rate=11059200/ +x[65535-(RCAP2H,RCAP2L)] where the rcap2h,rcap2l is the automatic reload value, from the above: rcap2h,rcap2l=65536-11059200/ +x baud rate is 115200 when the baud rate is rcap2h,rcap2l=0xFF，0xfd, the initialization program is as follows:voidInit_com (void) {SCON=0x50;//serial port operating mode 1, 8-bit UART, baud rate variableTh2=0xFF; TL2=0xFD;//baud rate: 115200 crystal oscillator =11.0592mhzRcap2h=0xFF; RCAP2L=0xFD;//16-bit auto Reload value/*****************/TCLK=1; RCLK=1; C_t2=0; EXEN2=0;//baud Rate Generator working mode/*****************/TR2=1;//Timer 2 Start}ok! This is achieved with 51 single-chip microcomputer + One.0592 Crystal Oscillator, the production of 115200 baud rate, of course, the veteran looks very basic, but a long time no, and then review ~ ~

[Turn]51 single-chip microcomputer 11.0592MHz generated 115200 baud rate