| 摘要 |
An integrated circuit comprises at least two inputs 18, 20, and a decoder 24 arranged to sample 28 said inputs in a first cycle and sample said inputs in a second, later cycle. A first memory location 34 is altered if only one of said sampled inputs changes from the first cycle to the second cycle, and a second memory location 46 is altered if both of said sampled inputs change from the first cycle to the second cycle. The decoder may generate an interrupt signal to a CPU if the first memory location and/or the second memory location is altered. The decoder may be for decoding inputs from a hardware peripheral device such as a wireless computer mouse. The inputs may be quadrature signals from an optical rotary encoder detecting movement from a scroll wheel. The decoder may be a quadrature decoder. |
