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C167CS bảng dữ liệu(PDF) 59 Page - Infineon Technologies AG |
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C167CS bảng dữ liệu(HTML) 59 Page - Infineon Technologies AG |
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59 / 517 page ![]() C167CS Derivatives The Central Processing Unit (CPU) User’s Manual 4-9 V2.0, 2000-07 BUSCON/ADDRSEL The instruction following an instruction that changes the properties of an external address area cannot access operands within the new area. In these cases an instruction that does not access this address area should be inserted. Code accesses to the new address area should be made after an absolute branch to this area. Note: As a rule, instructions that change external bus properties should not be executed from the respective external memory area. Timing Instruction pipelining reduces the average instruction processing time in a wide scale (from four to one machine cycles, mostly). However, there are some rare cases, where a particular pipeline situation causes the processing time for a single instruction to be extended either by a half or by one machine cycle. Although this additional time represents only a tiny part of the total program execution time, it might be of interest to avoid these pipeline-caused time delays in time critical program modules. Besides a general execution time description, Section 4.3 provides some hints on how to optimize time-critical program parts with regard to such pipeline-caused timing particularities. |
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