Cellular radio telephone set

Abstract

This invention relates to a cellular radio telephone set having a USB peripheral circuit which realizes a USB connection function. When the cellular radio telephone set is connected to an information processing terminal apparatus via a USB cable, a voltage Vbus supplied from the information processing terminal apparatus is regulated and supplied to the USB peripheral circuit. When the cellular radio telephone set is not connected to the information processing terminal apparatus via the USB cable, an application CPU which controls the USB peripheral circuit is shifted to a sleep mode.

What is claimed is:  
     
         1 . A cellular radio telephone set having a USB peripheral circuit which realizes a USB connection function, wherein when the cellular radio telephone set is connected to an information processing terminal apparatus via a USB cable, a voltage Vbus supplied from the information processing terminal apparatus is regulated and supplied to the USB peripheral circuit.  
     
     
         2 . A cellular radio telephone set having a USB peripheral circuit which realizes a USB connection function, wherein when the cellular radio telephone set is not connected to an information processing terminal apparatus via a USB cable, an application CPU which controls the USB peripheral circuit is shifted to a sleep mode.  
     
     
         3 . A cellular radio telephone set having a USB peripheral circuit which realizes a USB connection function, wherein when the cellular radio telephone set is connected to an information processing terminal apparatus via a USB cable, a voltage Vbus supplied from the information processing terminal apparatus is regulated and supplied to the USB peripheral circuit, and when the cellular radio telephone set is not connected to the information processing terminal apparatus via the USB cable, an application CPU which controls the USB peripheral circuit is shifted to a sleep mode.  
     
     
         4 . A cellular radio telephone set having a USB peripheral circuit which realizes a USB connection function, wherein when the cellular radio telephone set is not connected to an information processing terminal apparatus via a USB cable, an application CPU which controls the USB peripheral circuit is shifted to a sleep mode, and when the cellular radio telephone set is connected to the information processing terminal apparatus via the USB cable, the application CPU is waked up.  
     
     
         5 . A telephone set according to  claim 2 , wherein the sleep mode includes a low-power consumption operation mode.  
     
     
         6 . A telephone set according to  claim 3 , wherein the sleep mode includes a low-power consumption operation mode.  
     
     
         7 . A telephone set according to  claim 4 , wherein the sleep mode includes a low-power consumption operation mode.  
     
     
         8 . A telephone set according to  claim 1 , wherein whether the cellular radio telephone set is connected to the information processing terminal apparatus via the USB cable is determined by detecting presence/absence of the voltage Vbus supplied from the information processing terminal apparatus.  
     
     
         9 . A telephone set according to  claim 2 , wherein whether the cellular radio telephone set is connected to the information processing terminal apparatus via the USB cable is determined by detecting presence/absence of the voltage Vbus supplied from the information processing terminal apparatus.  
     
     
         10 . A telephone set according to  claim 3 , wherein whether the cellular radio telephone set is connected to the information processing terminal apparatus via the USB cable is determined by detecting presence/absence of the voltage Vbus supplied from the information processing terminal apparatus.  
     
     
         11 . A telephone set according to  claim 4 , wherein whether the cellular radio telephone set is connected to the information processing terminal apparatus via the USB cable is determined by detecting presence/absence of the voltage Vbus supplied from the information processing terminal apparatus.  
     
     
         12 . A telephone set according to  claim 5 , wherein whether the cellular radio telephone set is connected to the information processing terminal apparatus via the USB cable is determined by detecting presence/absence of the voltage Vbus supplied from the information processing terminal apparatus.  
     
     
         13 . A cellular radio telephone set having a USB connection function, comprising a USB connector which is connected to a USB cable connected to an information processing terminal apparatus including a personal computer, a USB device controller circuit for communicating with the information processing terminal apparatus via the USB connector connected to the USB cable, an application CPU-which controls the whole USB, a control CPU which controls the whole cellular radio telephone set, a regulator circuit which converts a voltage Vbus supplied from the information processing terminal apparatus via the USB cable into a voltage for the USB device controller circuit, and a Vbus detection circuit which detects presence/absence of the voltage Vbus.  
     
     
         14 . A telephone set according to  claim 13 , wherein said USB device controller circuit comprises a D+ pull-up circuit which pulls up a signal D+ for data communication with the information processing terminal apparatus, a controller which controls said D+ pull-up circuit, and a transmission/reception circuit which performs transmission/reception of USB data communication.