| 摘要 |
PURPOSE:To manage the product as a single product by writing a frequency division number of a programmable frequency divider into a writable ROM. CONSTITUTION:With a power switch Sw turned on, a CPU 1 detects it and gives a start signal to a decoder 22. The decoder 22 receiving the signal reads a frame, an address and frequency division information or the like given to itself from a PROM 21 and the frame, address are set in a register of the decoder 22 and the frequency division information is fed to a programmable frequency divider 20, in which the information is set therein. Thus, a signal lower than the signal to be received by a mixer circuit 6 is given from a PLL synthesizer 15. The reception signal given to the mixer circuit 6 is mixed with a signal from the PLL synthesizer 15 in the mixer circuit 16 and the result is converted into a 455kHz signal by a frequency conversion circuit and the result is given to a frequency discriminator 12. A CPU 1 implements lighting of a LED 29, calls a speaker 31, display to a display section 32 and storage to a RAM 25. |
