msp-uart-38400.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: 38400bps
  division factor: 65.1
  effective baud rate: 38402.5bps
  maximum error: 0.1916us   0.74%

  time table (microseconds):
        event      desired effective  error   error%
    startbit->D0     26.04     26.00  +0.0416  +0.16
    D0->D1           52.08     52.00  +0.0833  +0.32
    D1->D2           78.12     78.00   +0.125  +0.48
    D2->D3          104.17    104.00   +0.167  +0.64
    D3->D4          130.21    130.40   -0.192  -0.74
    D4->D5          156.25    156.40    -0.15  -0.58
    D5->D6          182.29    182.40   -0.108  -0.42
    D6->D7          208.33    208.40  -0.0666  -0.26
    D7->stopbit     234.38    234.40   -0.025  -0.10
    end of stopb    260.42    260.40  +0.0166  +0.06
*/
UBR00=0x41; UBR10=0x00; UMCTL0=0x10; /* uart0 2500000Hz 38402bps */
UBR01=0x41; UBR11=0x00; UMCTL1=0x10; /* uart1 2500000Hz 38402bps */