msp-uart-9600.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: 9600bps
  division factor: 3.4
  effective baud rate: 9637.65bps
  maximum error: 17.9036us  17.19%

  time table (microseconds):
        event      desired effective  error   error%
    startbit->D0    104.17    122.07    -17.9 -17.19
    D0->D1          208.33    213.62    -5.29  -5.08
    D1->D2          312.50    305.18    +7.32  +7.03
    D2->D3          416.67    427.25    -10.6 -10.16
    D3->D4          520.83    518.80    +2.03  +1.95
    D4->D5          625.00    640.87    -15.9 -15.23
    D5->D6          729.17    732.42    -3.26  -3.12
    D6->D7          833.33    823.97    +9.36  +8.98
    D7->stopbit     937.50    946.04    -8.54  -8.20
    end of stopb   1041.67   1037.60    +4.07  +3.91
*/
UBR00=0x03; UBR10=0x00; UMCTL0=0x29; /* uart0 32768Hz 9637bps */
UBR01=0x03; UBR11=0x00; UMCTL1=0x29; /* uart1 32768Hz 9637bps */