FUJITSU MB91F109 FR30 - Manual (Page 402)

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APPENDIX A I/O Maps
Do not execute RMW instructions for registers for which a write-only bit is set.
Data in areas marked as "Reserved" or "-" is undefined.
RMW instructions (RMW: Read Modify Write)
AND Rj, @Ri OR Rj, @Ri EOR Rj, @Ri
ANDH Rj, @Ri ORH Rj, @Ri EORH Rj, @Ri
ANDB Rj, @Ri ORB Rj, @Ri EORB Rj, @Ri
BANDL #u4, @Ri BORL #u4, @Ri BEORL #u4, @Ri
BANDH #u4, @Ri BORH #u4, @Ri BEORH #u4, @Ri