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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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HCS12 Scheda tecnica(PDF) 86 Page - Freescale Semiconductor, Inc |
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HCS12 Scheda tecnica(HTML) 86 Page - Freescale Semiconductor, Inc |
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86 / 452 page  S12CPUV2 Reference Manual, Rev. 4.0 86 Freescale Semiconductor 5.28 Background Mode and Null Operations Background debug mode (BDM) is a special CPU12 operating mode that is used for system development and debugging. Executing enter background debug mode (BGND) when BDM is enabled puts the CPU12 in this mode. For complete information, refer to Section 8. Instruction Queue. Null operations are often used to replace other instructions during software debugging. Replacing conditional branch instructions with branch never (BRN), for instance, permits testing a decision-making routine by disabling the conditional branch without disturbing the offset value. Null operations can also be used in software delay programs to consume execution time without disturbing the contents of other CPU registers or memory. Table 5-28 shows the BGND and null operation (NOP) instructions. Table 5-28. Background Mode and Null Operation Instructions Mnemonic Function Operation BGND Enter background debug mode If BDM enabled, enter BDM; else resume normal processing BRN Branch never Does not branch LBRN Long branch never Does not branch NOP Null operation — |
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