Patent ID: 6925574
Filing Date: 2005-08-02
Classification: H04N

Abstract:
1. An image forming apparatus having a communication unit, comprising: a power supply unit; a system control unit controlling the entire image forming apparatus, the system control unit having a CPU that is set in one of a normal mode, a power-saving mode and a sleep mode by controlling the power supply unit; 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 a return time that indicates a time the CPU is to be switched from one of the power-saving mode and the sleep 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 switched to the normal mode; and a system memory which stores at least one time-specified transmission operation data, wherein, when it is determined that the time-specified transmission operation data is stored in the system memory, the system control unit reads a time-specified transmission operation with an earliest transmission time from the system memory, and sets the earliest transmission time into the register as the return time.