| 摘要 |
This invention relates to realization of a more efficient power-saving mode in a printing apparatus capable of connecting an extension board for function enhancement. When the printing apparatus connects an extension board including a CPU and memory, the CPU of the extension board receives information required to return to a normal operation mode from a controller unit, and stores the received information in the memory before transition from the normal operation mode to the power-saving mode. Then, the controller unit lowers an operation frequency of a CPU thereof, and stops power supply to respective units of the apparatus, which do not require any power supply. In the power-saving mode, the extension board monitors an elapse of a predetermined time period and reception of print data, thereby, even in the power-saving mode, normally returning to the normal operation mode after the elapse of the time period. |
