msp-uart-57600.txt

来自「MSP430 //示范使用三种不同时脉来源 // Enter LPM3 w/」· 文本 代码 · 共 27 行

/*
  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: 57600bps
  division factor: 43.4
  effective baud rate: 57603.7bps
  maximum error: 0.2388us   1.38%

  time table (microseconds):
        event      desired effective  error   error%
    startbit->D0     17.36     17.60   -0.239  -1.38
    D0->D1           34.72     34.80  -0.0777  -0.45
    D1->D2           52.08     52.00  +0.0833  +0.48
    D2->D3           69.44     69.60   -0.155  -0.90
    D3->D4           86.81     86.80  +0.0055  +0.03
    D4->D5          104.17    104.40   -0.233  -1.34
    D5->D6          121.53    121.60  -0.0722  -0.42
    D6->D7          138.89    138.80  +0.0888  +0.51
    D7->stopbit     156.25    156.40    -0.15  -0.86
    end of stopb    173.61    173.60  +0.0111  +0.06
*/
UBR00=0x2B; UBR10=0x00; UMCTL0=0x29; /* uart0 2500000Hz 57603bps */
UBR01=0x2B; UBR11=0x00; UMCTL1=0x29; /* uart1 2500000Hz 57603bps */