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S3C72G9 Datasheet(PDF) 26 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 26 Page - Samsung semiconductor |
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26 / 96 page  !!" ADC (Continued) Examples: 3. If ADC A,@HL is followed by an ADS A,#im, the ADC skips on carry to the instruction immediately after the ADS. An ADS instruction immediately after the ADC does not skip even if an 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), 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 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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