mov #0xabcd, w10 ; Load first unlock key to w10 register 
mov #0x4321, w11 ; Load second unlock key to w11 register 
mov #0x0000, w0 ; Load desired value of FCLCON1 register in w0 
mov w10, PWMKEY ; Write first unlock key to PWMKEY register
mov w11, PWMKEY ; Write second unlock key to PWMKEY register 
mov w0, FCLCON1 ; Write desired value to FCLCON1 register ;