| 摘要 |
<p>PURPOSE:To obtain a microprocessor device which does not generate a problem of external radiation, by multiplying a clock signal applied from the outside of a package, and operating it as an operation clock signal. CONSTITUTION:An output of a crystal oscillating circuit 1 is inputted to a package through a wire 8, and also is inputted to a frequency multiplying circuit 5 through an amplifying circuit 2 and a buffer circuit 3. Oscillation frequency of the circuit 1 is, for instance, 0.5MHz, it is 4-multiplied by the circuit 5, and a clock signal of 2MHz is formed. An output signal 6 raised to necessary frequency by the circuit 5 is inputted to a CPU7, and is used as a clock signal. According to this system, a signal loaded on the wire 8 has comparatively low frequency, and its external radiation quantity is small, but to the CPU7, a clock of necessary frequency is supplied. As for the part operated by low frequency, and input signal 4 of the circuit 5 is inputted directly to the CPU7.</p> |
