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S3C72G9 Datasheet(PDF) 84 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 84 Page - Samsung semiconductor |
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84 / 96 page  -4 !+ !!" SBC (Continued) Examples: 3. If SBC A,@HL is followed by an ADS A,#im, the SBC skips on 'no borrow' to the instruction immediately after the ADS. An 'ADS A,#im' instruction immediately after the 'SBC A,@HL' instruction does not skip even if an overflow occurs. This function is useful for decimal adjustment operations. a. 8 - 6 decimal addition (the contents of the address specified by the HL register is 6H): RCF ; C ← "0" LD A,#8H ; A ← 8H SBC A,@HL ; A ← 8H - 6H - C(0) = 2H, C ← "0" ADS A,#0AH ; Skip this instruction because no borrow after SBC result JPS XXX b. 3 - 4 decimal addition (the contents of the address specified by the HL register is 4H): RCF ; C ← "0" LD A,#3H ; A ← 3H SBC A,@HL ; A ← 3H - 4H - C(0) = 0FH, C ← "1" ADS A,#0AH ; No skip. A ← 0FH + 0AH = 9H ; (The skip function of 'ADS A,#im' is inhibited after a ; 'SBC A,@HL' instruction even if an overflow occurs.) JPS XXX |
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