Electronic circuit and electronic device

An electronic device having a plurality of circuit blocks, each of the plurality of circuit blocks having at least one of a first circuit section or a second circuit section, comprising:

• a first circuit block which includes, as the first circuit section, a communication section, a modem, and a voice processing section and includes, as the second circuit section, at least an I/O and control section;
• a second circuit block which includes, as the first circuit section, a communication section and a modem and includes, as the second circuit section, at least a system base block and I/O and control section;
• a third circuit block which includes, as the first circuit section, an application section for image processing and includes, as the second circuit section, at least an I/O and control section;
• a fourth circuit block which includes, as the second circuit section, a timer circuit and a power supply section;
• a user-operable operation section which is connected to the second circuit block provided with the system base block;
• a clock generator which generates a first clock and a second clock having a frequency lower than that of the first clock and supplies the first circuit section and second circuit section with the first clock and second clock, respectively;
• and
• a power supply circuit which is provided in the power supply section and supplies the circuit sections operating at the first clock with a first power supply voltage and supplies the circuit section operating at the second clock with a second power supply voltage lower than the first power supply voltage.