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S3C9442 Datasheet(PDF) 18 Page - Samsung semiconductor |
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S3C9442 Datasheet(HTML) 18 Page - Samsung semiconductor |
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18 / 50 page  SAM88RCRI INSTRUCTION SET S3C9442/C9444/F9444/C9452/C9454/F9454 6-18 CP — Compare CP dst,src Operation: dst – src The source operand is compared to (subtracted from) the destination operand, and the appropriate flags are set accordingly. The contents of both operands are unaffected by the comparison. Flags: C: Set if a "borrow" occurred (src > dst); cleared otherwise. Z: Set if the result is "0"; cleared otherwise. S: Set if the result is negative; cleared otherwise. V: Set if arithmetic overflow occurred, that is, if the operands were of opposite signs and the sign of the result is of the same as the sign of the source operand; cleared otherwise. Format: Bytes Cycles Opcode (Hex) Addr Mode dst src opc dst | src 2 4 A2 r r 6 A3 r lr opc src dst 3 6 A4 R R 6 A5 R IR opc dst src 3 6 A6 R IM Examples: 1. Given: R1 = 02H and R2 = 03H: CP R1,R2 → Set the C and S flags Destination working register R1 contains the value 02H and source register R2 contains the value 03H. The statement "CP R1,R2" subtracts the R2 value (source/subtrahend) from the R1 value (destination/minuend). Because a "borrow" occurs and the difference is negative, C and S are "1". 2. Given: R1 = 05H and R2 = 0AH: CP R1,R2 JP UGE,SKIP INC R1 SKIP LD R3,R1 In this example, destination working register R1 contains the value 05H which is less than the contents of the source working register R2 (0AH). The statement "CP R1,R2" generates C = "1" and the JP instruction does not jump to the SKIP location. After the statement "LD R3,R1" executes, the value 06H remains in working register R3. |
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