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dspic 30f6010a pll issue with ccs

how to enable pll in dspic 30f6010a ic i use the following


#FUSES NOWDT //No Watch Dog Timer
#FUSES XT_PLL16
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES NOBROWNOUT //No brownout reset

#device ICSP=1

#use delay(clock=64MHz,crystal=4MHz)


i am using 4 mhz crystal and enabling 16x pll so that i can get 64mhz

but the pll 64mhz is not working no response i just wrote a led toggle program but it is not toglling



if i take this 2 lines

#FUSES XT_PLL16
#use delay(clock=64MHz,crystal=4MHz)


and add this line

#use delay(crystal=4MHz)

it is working perfect without pll enabling it is working perfect

this problem i am facing only in dspic ordinary pic 18f series works


kindly give the steps for enabling pll in ccs complier



regards
kalyan