Application processor, the mobile phone apparatus with the same and method for selecting a clock signal for an application processor

An application processor (100) comprises a main central processing device (120) based on an external master clock signal, which is received by at least one external clock source (220) operates when the application processor (100) is in an active mode, at least an internal clock source (160) which generates an internal clock signal and a sensor subsystem (140) to which sample data, which are received from at least one sensor module (210) in a predetermined clock processed when the application processor (100) in the is the active mode or a sleep mode and which is based on the internal clock signal or an external sub clock-signal which is received from the external clock source (220), depending on an operating speed, which is required for processing the sample data, operates.