| 摘要 |
PURPOSE: An oscillation circuit is provided to change frequency according to peripheral condition, to externally regulate oscillation condition, and to eliminate a clock source. CONSTITUTION: An oscillation circuit includes a D flip-flop(10), many delay circuits(20, 50,60, 70), a multiplexer(40) and a selection-signal generation circuit(80). The D flip-flop(10) latches an input signal. The delay circuits(20, 50, 60, 70) delay the output signal from the D flip-flop(10). The multiplexer(40) selectively outputs one of the input signals from the delay circuits(20, 50, 60, 70), according to at least one selection signal. The selection-signal generation circuit(80) generates the selection signal corresponding to a signal applied from external.
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