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hi, i am using 14.746Mhz crystal for lpc210x.i want to find baudrate setting for this crytal frequency.anybody explain with the formula rgds, mani |
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baud rate calculation for lpc210x
Started by ●November 5, 2004
Reply by ●November 5, 20042004-11-05
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hi here is the uart baud rate calculation Baudrate=(ProcessorClock)/(16*BaudDivider Reg) if you are using 14.7456MHz crystal and not using Internal PLL of the lpc and processor clock is div 4 HERE IS THE FORMULA BAUDRATE=(14.7546MHz/4)/(16*(BaudDivider Reg)) i.e for 14400 Baudrate 14.7456MHz/(4*16*16) BaudDivider Reg if you are using PLL say it is 4 times the Crystal Frequency BAUDRATE=(14.7546MHz*4)/(16*(BaudDivider Reg)) i.e for 14400 Baudrate 14.7456MHz*4/(16*256) BaudDivider Reg%6 ie LowBaudReg=0 HighBaudReg=1 hopes it will help you shridhar --- aravindar_manikandan <> wrote: > > hi, > > i am using 14.746Mhz crystal for lpc210x.i want to > find baudrate > setting for this crytal frequency.anybody explain > with the formula > > rgds, > mani > > __________________________________ |
Reply by ●November 5, 20042004-11-05
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At 06:14 PM 11/5/04 +0000, you wrote: >i am using 14.746Mhz crystal for lpc210x.i want to find baudrate >setting for this crytal frequency.anybody explain with the formula Well it will depend on the pll and vpb settings as well as the crystal speed. Basically divisor = vpbrate/(baud *16); U0DLM = high 8 bits of divisor U0DLL = low 8 bits of divisor There is a generalized version in the uart driver in the lpc-newlib . Robert " 'Freedom' has no meaning of itself. There are always restrictions, be they legal, genetic, or physical. If you don't believe me, try to chew a radio signal. " Kelvin Throop, III |
