OK.

I made my software better.
Now I have room to the stack.

How can I use the gap for the stack too ?

I had calculate that stack need to be 18 bytes !

8 bytes for 4 level subroutines calls (2 bytes for each subroutine (return address)

10 bytes for 2 possible ISP (5 butes for each one)

Are these right ?

TYPE BASE LENGTH RELOCATION SEGMENT NAME
* * * * * * * D A T A M E M O R Y * * * * * * *
REG 0000H 0008H ABSOLUTE "REG BANK 0"
DATA 0008H 000EH UNIT _DATA_GROUP_
0016H 000AH *** GAP ***
DATA 0020H 0002H BIT_ADDR ?BA?MU01
DATA 0022H 004FH UNIT ?DT?MU01
IDATA 0071H 0001H UNIT ?STACK