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HCS12 Datasheet(PDF) 166 Page - Freescale Semiconductor, Inc |
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HCS12 Datasheet(HTML) 166 Page - Freescale Semiconductor, Inc |
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166 / 452 page  Instruction Glossary S12CPUV2 Reference Manual, Rev. 4.0 166 Freescale Semiconductor Operation: (B) – $01 ⇒ B Description: Subtract one from the content of accumulator B. The N, Z, and V status bits are set or cleared according to the results of the operation. The C status bit is not affected by the operation, thus allowing the DEC instruction to be used as a loop counter in multiple-precision computations. DECB Decrement B DECB CCR Details: S X HIN Z V C –––– ∆∆∆ – N: Set if MSB of result is set; cleared otherwise Z: Set if result is $00; cleared otherwise V: Set if there was a two’s complement overflow as a result of the operation; cleared otherwise. Two’s complement overflow occurs if and only if (B) was $80 before the operation. Source Form Address Mode Object Code Access Detail HCS12 M68HC12 DECB INH 53 O O |
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