| 摘要 |
A temperature-compensated crystal oscillator includes a mode selector circuit 100 , a control logic serial.interface 200 , a PROM circuit 300 , an oscillation control circuit 400 and an oscillation circuit 500 , and has, as terminals, a power terminal (VCC/CLK) 11 , an input terminal (VC/DATA/PE) 12 , an output terminal (OUT) 13 and a ground terminal (GND) 14 . The mode selector circuit 100 switches the crystal oscillator to an emulation mode when a first signal in which a power voltage and a clock signal supplied through the power terminal 11 are superimposed, is inputted from the power terminal and a second signal having a predetermined pattern is inputted from the input terminal 12.
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