while((FCNTL/128) != 1) _nop_();
TA = 0xAA;
TA = 0x55;
FCNTL = 0x0B;
FDATA = hiadd; //upper 2 bytes of address
FDATA = loadd; //lower 2 bytes of address
FDATA = wdata; //data to be written
if(FCNTL/128 == 1) while((FCNTL/128) != 0) _nop_();
while((FCNTL/128) != 1} _nop_();
TA = 0xAA;
TA = 0x55;
FCNTL = 0;

Just to restate that it only loses the data on power down - power up.