iec.naga@ymail.com
Newbie level 2
pll feed sequence is always 0xaa followed by 0x55. why is it so. what is the format of pllfeed register in lpc2148. how to configure it.
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There is No format for feed register when toggling all its bits it starts PLL..pll feed sequence is always 0xaa followed by 0x55. why is it so. what is the format of pllfeed register in lpc2148. how to configure it.
Code C - [expand] 1 2 3 4 5 6 7 void PLL_init(void) { PLLCFG = 0x00080016; // configure PLLCON = 0x00000003; // enable PLLFEED = 0x000000AA; // feed PLLFEED = 0x00000055; }
pll feed sequence is always 0xaa followed by 0x55. why is it so. what is the format of pllfeed register in lpc2148. how to configure it.
There is No format for feed register when toggling all its bits it starts PLL..
0xAA 10101010
0x55 01010101
[/syntax]
why do we need to give these values by consecutive clock cycles? If you say it's just to toggle the bits, you can also give the sequence in the reverse order too? Why it doesn't work when you change the sequence?
Can you please explain me?
Yeah, That is its architecture thats why we are doing....
Hi naga,Dear Venkadeshm..
thanks for your reply. but i would like to know the architecture of pllfeed sequence. . .
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Dear Sir
may i know y only this feed sequence is required. but i am really thankful for your answer sir.