msp-uart-115200.txt

MSP430 //示范使用三种不同时脉来源 // Enter LPM3 w/ interrupt /* Convert EOL to CR/LF */

/*
  uart calculator: http://mspgcc.sourceforge.net/baudrate.html
  this program license is at: http://www.fsf.org/licenses/licenses.html#GPL
  this program is distributed WITHOUT ANY WARRANTY

  clock: 2500000Hz
  desired baud rate: 115200bps
  division factor: 21.7
  effective baud rate: 115207bps
  maximum error: 0.2444us   2.82%

  time table (microseconds):
        event      desired effective  error   error%
    startbit->D0      8.68      8.80   -0.119  -1.38
    D0->D1           17.36     17.60   -0.239  -2.75
    D1->D2           26.04     26.00  +0.0416  +0.48
    D2->D3           34.72     34.80  -0.0777  -0.90
    D3->D4           43.40     43.60   -0.197  -2.27
    D4->D5           52.08     52.00  +0.0833  +0.96
    D5->D6           60.76     60.80  -0.0361  -0.42
    D6->D7           69.44     69.20   +0.244  +2.82
    D7->stopbit      78.12     78.00   +0.125  +1.44
    end of stopb     86.81     86.80  +0.0055  +0.06
*/
UBR00=0x15; UBR10=0x00; UMCTL0=0x5B; /* uart0 2500000Hz 115207bps */
UBR01=0x15; UBR11=0x00; UMCTL1=0x5B; /* uart1 2500000Hz 115207bps */