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HCS12 Datasheet(PDF) 300 Page - Freescale Semiconductor, Inc |
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HCS12 Datasheet(HTML) 300 Page - Freescale Semiconductor, Inc |
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300 / 452 page  Instruction Glossary S12CPUV2 Reference Manual, Rev. 4.0 300 Freescale Semiconductor Operation: (A) – $00 Description: Subtracts $00 from the content of accumulator A and sets the condition codes accordingly. The subtraction is accomplished internally without modifying A. The TSTA instruction provides limited information when testing unsigned values. Since no unsigned value is less than zero, BLO and BLS have no utility following TSTA. While BHI can be used after TST, it performs the same function as BNE, which is preferred. After testing signed values, all signed branches are available. TSTA Test A TSTA CCR Details: S X HIN Z V C –––– ∆∆ 00 N: Set if MSB of result is set; cleared otherwise Z: Set if result is $00; cleared otherwise V: 0; cleared C: 0; cleared Source Form Address Mode Object Code Access Detail HCS12 M68HC12 TSTA INH 97 O O |
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