msp-uart-2400.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: 32768Hz
  desired baud rate: 2400bps
  division factor: 13.6
  effective baud rate: 2409.41bps
  maximum error: 16.276us   3.91%

  time table (microseconds):
        event      desired effective  error   error%
    startbit->D0    416.67    427.25    -10.6  -2.54
    D0->D1          833.33    823.97    +9.36  +2.25
    D1->D2         1250.00   1251.22    -1.22  -0.29
    D2->D3         1666.67   1678.47    -11.8  -2.83
    D3->D4         2083.33   2075.20    +8.14  +1.95
    D4->D5         2500.00   2502.44    -2.44  -0.59
    D5->D6         2916.67   2929.69      -13  -3.12
    D6->D7         3333.33   3326.42    +6.92  +1.66
    D7->stopbit    3750.00   3753.66    -3.66  -0.88
    end of stopb   4166.67   4150.39    +16.3  +3.91
*/
UBR00=0x0D; UBR10=0x00; UMCTL0=0x6D; /* uart0 32768Hz 2409bps */
UBR01=0x0D; UBR11=0x00; UMCTL1=0x6D; /* uart1 32768Hz 2409bps */