Samsung C8278X ユーザーズマニュアル

The opcode of a conditional jump always contains a 4-bit field called the condition code (cc). This specifies under 
which conditions it is to execute the jump. For example, a conditional jump with the condition code for "equal" 
after a compare operation only jumps if the two operands are equal. Condition codes are listed in Table 6-6. 

The carry (C), zero (Z), sign (S), and overflow (V) flags are used to control the operation of conditional jump 
instructions. 

0000 F 

Always 

false 

− 

1000 T 

Always 

true 

− 

0111 

(note)

 

C 

Carry 

C = 1 

1111 

(note)

 

NC 

No carry 

C = 0 

0110 

(note)

 

Z 

Zero 

Z = 1 

1110 

(note)

 

NZ 

Not zero 

Z = 0 

1101 

PL 

Plus 

S = 0 

0101 

MI 

Minus 

S = 1 

0100 

OV 

Overflow 

V = 1 

1100 

NOV 

No overflow 

V = 0 

0110 

(note)

 

EQ 

Equal 

Z = 1 

1110 

(note)

 

NE 

Not equal 

Z = 0 

1001 

GE 

Greater than or equal 

(S    XOR    V) = 0 

0001 

LT 

Less than 

(S  XOR  V) = 1 

1010 

GT 

Greater than 

(Z  OR (S  XOR  V)) = 0 

0010 

LE 

Less than or equal 

(Z  OR (S  XOR  V)) = 1 

1111 

(note)

 

UGE 

Unsigned greater than or equal 

C = 0 

0111 

(note)

 

ULT 

Unsigned less than 

C = 1 

1011 

UGT 

Unsigned greater than 

(C = 0    AND    Z = 0) = 1 

0011 

ULE 

Unsigned less than or equal 

(C    OR    Z) = 1 

NOTES: 
1.  It indicates condition codes that are related to two different mnemonics but which test the same flag. For   
 

example, Z and EQ are both true if the zero flag (Z) is set, but after an ADD instruction, Z would probably be used;   

 

after a CP instruction, however, EQ would probably be used. 

2.  For operations involving unsigned numbers, the special condition codes UGE, ULT, UGT, and ULE must be used.