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S3C72G9 Datasheet(PDF) 28 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 28 Page - Samsung semiconductor |
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28 / 96 page  # $%&'!()% ADS (Continued) Examples: 2. If the extended accumulator contains the value 0C3H, register pair HL the value 12H, and the carry flag = "0": ADS EA,HL ; EA ← 0C3H + 12H = 0D5H JPS XXX ; Jump to XXX; no skip after ADS. 3. If 'ADC A,@HL' is followed by an 'ADS A,#im', the ADC skips on overflow to the instruction mmediately after the ADS. An 'ADS A,#im' instruction immediately after the 'ADC A,@HL' does not skip even if overflow occurs. This function is useful for decimal adjustment operations. a. 8 + 9 decimal addition (the contents of the address specified by the HL register is 9H): RCF ; C ← "0" LD A,#8H ; A ← 8H ADS A,#6H ; A ← 8H + 6H = 0EH ADC A,@HL ; A ← 0EH + 9H + C(0) = 7H, C ← "1" ADS A,#0AH ; Skip this instruction because C = "1" after ADC 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 ADS A,#6H ; A ← 3H + 6H = 9H ADC A,@HL ; A ← 9H + 4H + C(0) = 0DH, C ← "0" ADS A,#0AH ; No skip. A ← 0DH + 0AH = 7H ; (The skip function for 'ADS A,#im' is inhibited after an ; 'ADC A,@HL' instruction even if an overflow occurs.) JPS XXX |
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