how to calculate baud rate for lpc2148

[ANJUSHA]

 i  came to know from manual baud rate= Pclk/16/(256*udlm+udll)/A;

 

WHERE A=1+(divaddval/mulvalue);

 

i taken pclk 12mhz (CRYSTAL FREQUENCY)  ,baud rate=9600  and A=1, i got udlm+udll= 78.125;

 

so i taken udll=0X4E AND dlm=0x00 in intializing uart….i simulated in keil,after debugging in peripheral window –>uart0—>my baud rate value got changed it is 12018…can you tell where the baud rate calculation i got wrong..

 

[AJISH ALFRED]

Hi Abiram,

Suggest you to check the clock settings, make sure that your microcontroller is running with the external crystal oscillator and not with the built-in oscillator.

[ANJUSHA]

 

    hello sir,

 

         i calculated and i got it…i taken pclk as 30MHZ, by considering VPBCLK as 0x02;

[AJISH ALFRED]

That’s great Abiram. Keep up the good work.

[Kapildev]

sir,

plz explain interrupt in lpc2148,i con't unterstood the data sheet plz give simple explaination,

how to program for the interrupt 

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