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HCS12 数据表(PDF) 28 Page - Freescale Semiconductor, Inc |
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HCS12 数据表(HTML) 28 Page - Freescale Semiconductor, Inc |
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28 / 452 page ![]() S12CPUV2 Reference Manual, Rev. 4.0 28 Freescale Semiconductor Sixteen-bit values are stored in memory as two consecutive bytes; the high byte occupies the lowest address, but need not be aligned to an even boundary. Thirty-two-bit values are stored in memory as four consecutive bytes; the high byte occupies the lowest address, but need not be aligned to an even boundary. All input/output (I/O) and all on-chip peripherals are memory-mapped. No special instruction syntax is required to access these addresses. On-chip registers and memory typically are grouped in blocks which can be relocated within the standard 64-Kbyte address space. Refer to device documentation for specific information. 2.5 Instruction Queue The CPU12 uses an instruction queue to buffer program information. The mechanism is called a queue rather than a pipeline because a typical pipelined CPU executes more than one instruction at the same time, while the CPU12 always finishes executing an instruction before beginning to execute another. Refer to Section 4. Instruction Queue for more information. |
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