mov #0xabcd, w10 ; Load first unlock key to w10 register 
mov #0x4321, w11 ; Load second unlock key to w11 register 
mov #0xF000, w0 ; Load desired value of IOCON1 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, IOCON1 ; Write desired value to IOCON1 register