Electronic apparatus with communication function having power source

Abstract

In a normal state, a time counting process and a key input process are performed in accordance with an oscillation signal of 38.4 KHz generated by a crystal oscillator. In a data communication mode, a process for exchanging data with an external appliance is performed in accordance with a frequency-divided signal of the above oscillation signal and received data are stored in a memory simultaneously in a high speed process under control of an oscillation signal of 800 KHz generated by a CR oscillator. A power source circuit provides a high power source voltage, preventing all circuits from a defective operation while the high speed process is performed since the high speed process can decrease a power source voltage.