msp-uart-19200.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: 19200bps
  division factor: 130.2
  effective baud rate: 19201.2bps
  maximum error: 0.1833us   0.35%

  time table (microseconds):
        event      desired effective  error   error%
    startbit->D0     52.08     52.00  +0.0833  +0.16
    D0->D1          104.17    104.00   +0.167  +0.32
    D1->D2          156.25    156.40    -0.15  -0.29
    D2->D3          208.33    208.40  -0.0666  -0.13
    D3->D4          260.42    260.40  +0.0166  +0.03
    D4->D5          312.50    312.40  +0.0999  +0.19
    D5->D6          364.58    364.40   +0.183  +0.35
    D6->D7          416.67    416.80   -0.133  -0.26
    D7->stopbit     468.75    468.80    -0.05  -0.10
    end of stopb    520.83    520.80  +0.0333  +0.06
*/
UBR00=0x82; UBR10=0x00; UMCTL0=0x84; /* uart0 2500000Hz 19201bps */
UBR01=0x82; UBR11=0x00; UMCTL1=0x84; /* uart1 2500000Hz 19201bps */