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ST20-C1 Datasheet(PDF) 156 Page - STMicroelectronics |
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ST20-C1 Datasheet(HTML) 156 Page - STMicroelectronics |
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156 / 205 page  156/205 ® subc subtract with carry Code: 21 F1 Description: Subtract Areg from 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 ( diff ≥ 0) { Areg ′ unsigned ← diff Status ′ carry ← clear } else { Areg ′ unsigned ← diff + 2BitsPerWord Status ′ carry ← set } Breg ′← Creg Creg ′← Areg where diff = (Breg unsigned − Aregunsigned) - Statuscarry – the value of diff is calculated to unlimited precision Status Register: Carry bit is set or cleared. Comments: Secondar y instruction. See also: addc sub section 4.4. |
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