| 摘要 |
Typically, for instructions of any length, strobing of input data is performed during every clock cycle (201, 210) even when data is not yet available on a data bus (110). For some instructions, more than one clock cycle (201, 210) is required in order to provide the data to the data bus (110), thus, unnecessary strobing wastes electrical power. The embodiment of the invention serves to overcome this limitation by only strobing of input data when the data is ready on the input bus (110), thus providing a variable input phase. The strobing of the input data is dependent upon a characteristic of the instruction, such as instruction type, an address mode of the instruction, an internal access, an external access, and bus width for utilization by a microcontroller (102) in executing of the instruction. Thus, instructions having different characteristics have different input phases.
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