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S3C9442 Datasheet(PDF) 9 Page - Samsung semiconductor |
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S3C9442 Datasheet(HTML) 9 Page - Samsung semiconductor |
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9 / 50 page  S3C9442/C9444/F9444/C9452/C9454/F9454 SAM88RCRI INSTRUCTION SET 6-9 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 Mnemonic Description Flags Set 0000 F Always false – 1000 T Always true – 0111 (1) C Carry C = 1 1111 (1) NC No carry C = 0 0110 (1) Z Zero Z = 1 1110 (1) 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 (1) EQ Equal Z = 1 1110 (1) 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 (1) UGE Unsigned greater than or equal C = 0 0111 (1) 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. |
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