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ST20-C1 Datasheet(PDF) 90 Page - STMicroelectronics |
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ST20-C1 Datasheet(HTML) 90 Page - STMicroelectronics |
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90 / 205 page  90/205 ® addc add with carry Code: 21 F0 Description: Add Areg and Breg, unsigned, with carry propagation. This instruction is provided for long arithmetic; address calculations may be performed with add, sub and adc without affecting the carry flag. Definition: if (sum < 2BitsPerWord) { Areg ′ unsigned ← sum Status ′ carry ← clear } else { Areg ′ unsigned ← sum - 2BitsPerWord Status ′ carry ← set } Breg ′← Creg Creg ′← Areg where sum = Areg unsigned + Bregunsigned + Statuscarry – the value of sum is calculated to unlimited precision Status Register: Carry bit is set or cleared. Comments: Secondar y instruction. See also: adc add subc section 4.4. |
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