Patent ID: 7254731
Filing Date: 2007-08-07
Classification: H04N

Abstract:
1. An electrical device having a communication unit, the electrical device comprising: a system control unit controlling the entire electrical device, the system control unit having a CPU that is set in one of a normal mode and a power-saving mode by controlling a power supply unit, wherein, when the CPU is set in the normal mode, a power output from the power supply unit is supplied to electrical components of the electrical device, and when the CPU is set in the power-saving mode, the power supplied to the electrical components in the normal mode is cut off or reduced and the electrical device is set in a standby state; a real-time clock keeping track of hours, minutes and seconds of a current time and outputting a signal indicating the current time; a register storing at least a return time that indicates a time the CPU is to be switched from the power-saving mode to the normal mode; a comparator comparing the current time output from the clock with the return time stored in the register, and outputting, when a match occurs, a control signal to the CPU so that the CPU is automatically switched from the power-saving mode to the normal mode; and a system memory which stores at least one time-specified operation data; wherein the system control unit comprises: a reading unit reading, when the time-specified transmission operation data is stored in the system memory, a time-specified operation with an earliest transmission time from the system memory; and a setting unit setting the earliest transmission time, read by the reading unit, into the register as the return time.