546CHAPTER 25 ROM CORRECTION25.7 Cautions on ROM Correction(1) Address values set in correction address registers 0 and 1 (CORAD0, CORAD1) must be addresses whereinstruction codes are stored.(2) Correction address registers 0 and 1 (CORAD0, CORAD1) should be set when the correction enable flag(COREN0, COREN1) is 0 (when the correction branch is in disabled state). If address is set to CORAD0 orCORAD1 when COREN0 or COREN1 is 1 (when the correction branch is in enabled state), the correctionbranch may start with the different address from the set address value.(3) Do not set the address value of instruction immediately after the instruction that sets the correction enableflag (COREN0, COREN1) to 1, to correction address register 0 or 1 (CORAD0, CORAD1) ; the correctionbranch may not start.(4) Do not set the address value in table area of table reference instruction (CALLT instruction) (0040H to 007FH),and the address value in vector table area (0000H to 003FH) to correction address registers 0 and 1 (CORAD0,CORAD1).(5) Do not set two addresses immediately after the instructions shown below to correction address registers 0and 1 (CORAD0, CORAD1). (that is, when the mapped terminal address of these instructions is N, do notset the address values of N+1 and N+2.)• RET• RETI• RETB• BR $addr16• STOP• HALT
