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S3C72G9 Datasheet(PDF) 5 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 5 Page - Samsung semiconductor |
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5 / 96 page  INSTRUCTIONS WHICH AFFECT THE CARRY FLAG The only instructions which do not generate a skip signal, but which do affect the carry flag are as follows: ADC LDB C,(operand) SBC BAND C,(operand) SCF BOR C,(operand) RCF BXOR C,(operand) CCF IRET RRC ADC AND SBC INSTRUCTION SKIP CONDITIONS The instructions 'ADC A,@HL' and 'SBC A,@HL' can generate a skip signal, and set or clear the carry flag, when they are executed in combination with the instruction 'ADS A,#im'. If an 'ADS A,#im' instruction immediately follows an 'ADC A,@HL' or 'SBC A,@HL' instruction in a program sequence, the ADS instruction does not skip the instruction following ADS, even if it has a skip function. If, however, an 'ADC A,@HL' or 'SBC A,@HL' instruction is immediately followed by an 'ADS A,#im' instruction, the ADC (or SBC) skips on overflow (or if there is no borrow) to the instruction immediately following the ADS, and program execution continues. Table 5-3 contains additional information and examples of the 'ADC A,@HL' and 'SBC A,@HL' skip feature. Table 5-3. Skip Conditions for ADC and SBC Instructions Sample Instruction Sequences If the result of instruction 1 is: Then, the execution sequence is: Reason ADC A,@HL ADS A,#im xxx xxx 1 2 3 4 Overflow No overflow 1, 3, 4 1, 2, 3, 4 ADS cannot skip instruction 3, even if it has a skip function. SBC A,@HL ADS A,#im xxx xxx 1 2 3 4 Borrow No borrow 1, 2, 3, 4 1, 3, 4 ADS cannot skip instruction 3, even if it has a skip function. |
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