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S3C72G9 Datasheet(PDF) 55 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 55 Page - Samsung semiconductor |
55 / 96 page ![]() +!'2'#$%!!" INCS dst Operation: Operand Operation Summary Bytes Cycles R Increment register (R); skip on carry 1 1 + S DA Increment direct data memory; skip on carry 2 2 + S @HL Increment indirect data memory; skip on carry 2 2 + S RRb Increment register pair (RRb); skip on carry 1 1 + S Description: The instruction INCS increments the value of the destination operand by one. An original value of 0FH will, for example, overflow to 00H. If a carry occurs, the next instruction is skipped. The carry flag value is unaffected. Operand Binary Code Operation Notation R 0 1 0 1 1 r2 r1 r0 R ← R + 1; skip on carry DA 1 1 0 0 1 0 1 0 DA ← DA + 1; skip on carry a7 a6 a5 a4 a3 a2 a1 a0 @HL 1 1 0 1 1 1 0 1 (HL) ← (HL) + 1; skip on carry 0 1 1 0 0 0 1 0 RRb 1 0 0 0 0 r2 r1 0 RRb ← RRb + 1; skip on carry Example: Register pair HL contains the value 7EH (01111110B). RAM location 7EH contains 0FH. The instruction sequence INCS @HL ; 7EH ← "0" INCS HL ; Skip INCS @HL ; 7EH ← "1" leaves the register pair HL with the value 7EH and RAM location 7EH with the value 1H. Since a carry occurred, the second instruction is skipped. The carry flag value remains unchanged. |
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