Hi,
If you want to write $7b into $ffd1, enter
lda #$7b
sta $ffd1
If you want to get the data from the RAM cell $7b, write
lda $7b
sta $ffd1
But if you run it on a HC908JB16, nothing will happen because the cell $ffd1 is a Flash EPROM cell and cannot be written during normal operation.
Instead you should write in your assembly code
org $ffd1
dc.b $7b
If you are writing a Flash EPROM programming routine, you should write
lda $7b
sta $ffd1
as a part of a much more complex algoritm.
Did that help?
Regards,
Ake