my circuit uses PIC24FJ256GB110. i wanted to interface a USB flash memory stick. My PIC working voltage is 3V. PIC working as a usb host, so it should give 5V to the USB device. I want to use "Internal Voltage Boost Assist for USB Bus Voltage Generation" But i didnt get the required information or schematics. what i understood is VCPCON is pwm output, i connected this to a boost circuit. then the output is connected to the VBUS. but where to connect the VBUSST,VCMPST2 and VCMPST1 pins. Thanks in advance YOurs SaRIn.... -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist