680x0:Condition codes

Condition codes are used in branch instructions Bcc and DBcc. Replace the cc with any of the code you see in the list. Example If you like to branch/goto another place in the code if a signed number is greater or equal to 8 use: CMP.B #8,D0 BGE ItsGreaterOrEqual ItsGreaterOrEqual: Signed/unsigned Unsigned numbers can only be positive, while in signed numbers the highest bit is used to tell if the number is negative. As assembler programmer it's up to you to conciously choose the correct condition code for signed/unsigned numbers.

cc mathematical meaning bitcode signed comment NE b<>a Not equal 0110 EQ b==a Equal 0111 HI b>a HIgher 0010 unsigned LO b<a LOwer unsigned HS b>=a Higher or Same unsigned LS b<=a Lower or same 0011 unsigned GT b>a Greater Then 1110 signed LT b<a Less Then 1101 signed GE b>=a Greater then or Equal 1100 signed LE b<=a Less then or Equal 1111 signed MI b<0 Minus 1011 PL b>0 Plus 1010 CC Carry clear 0100 CS Carry set 0101 VC No overflow 1000 VS Overflow 1001 (the next 2 are not known by all assemblers, because they aren't really usefull) (Seka does know them) T True 0000 allways branch, same as bra F False 0001 never branch