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S3C72G9 Datasheet(PDF) 85 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 85 Page - Samsung semiconductor |
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85 / 96 page  -4 !+ SBS dst,src Operation: Operand Operation Summary Bytes Cycles A,@HL Subtract indirect data memory from A; skip on borrow 1 1 + S EA,RR Subtract register pair (RR) from EA; skip on borrow 2 2 + S RRb,EA Subtract EA from register pair (RRb); skip on borrow 2 2 + S Description: The source operand is subtracted from the destination operand and the result is stored in the destination. The contents of the source are unaffected. A skip is executed if a borrow occurs. The value of the carry flag is not affected. Operand Binary Code Operation Notation A,@HL 0 0 1 1 1 1 0 1 A ← A - (HL); skip on borrow EA,RR 1 1 0 1 1 1 0 0 EA ← EA - RR; skip on borrow 1 0 1 1 1 r2 r1 0 RRb,EA 1 1 0 1 1 1 0 0 RRb ← RRb - EA; skip on borrow 1 0 1 1 0 r2 r1 0 Examples: 1. The accumulator contains the value 0C3H, register pair HL contains the value 0C7H, and the carry flag is cleared to logic zero: RCF ; C ← "0" SBS EA,HL ; EA ← 0C3H - 0C7H ; SBS instruction skips on borrow, ; but carry flag value is not affected JPS XXX ; Skip because a borrow occurred JPS YYY ; Jump to YYY is executed 2. The accumulator contains the value 0AFH, register pair HL contains the value 0AAH, and the carry flag is set to logic one: SCF ; C ← "1" SBS EA,HL ; EA ← 0AFH - 0AAH JPS XXX ; Jump to XXX ; JPS was not skipped since no "borrow" occurred after ; SBS |
Similar Part No. - S3C72G9 |
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Similar Description - S3C72G9 |
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