S3C9454B View Datasheet(PDF) - Samsung
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MFG CO.
'S3C9454B' PDF : 199 Pages View PDF
S3C9454B/F9454B
SAM88RCRI INSTRUCTION SET
CONDITION CODES
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.
Table 6-6. Condition Codes
Binary
0000
1000
0111 (1)
1111 (1)
0110 (1)
1110 (1)
1101
0101
0100
1100
0110 (1)
1110 (1)
1001
0001
1010
0010
1111 (1)
0111 (1)
1011
0011
Mnemonic
F
T
C
NC
Z
NZ
PL
MI
OV
NOV
EQ
NE
GE
LT
GT
LE
UGE
ULT
UGT
ULE
Description
Always false
Always true
Carry
No carry
Zero
Not zero
Plus
Minus
Overflow
No overflow
Equal
Not equal
Greater than or equal
Less than
Greater than
Less than or equal
Unsigned greater than or equal
Unsigned less than
Unsigned greater than
Unsigned less than or equal
Flags Set
–
–
C=1
C=0
Z=1
Z=0
S=0
S=1
V=1
V=0
Z=1
Z=0
(S XOR V) = 0
(S XOR V) = 1
(Z OR (S XOR V)) = 0
(Z OR (S XOR V)) = 1
C=0
C=1
(C = 0 AND Z = 0) = 1
(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.
6-9
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