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USB 2.0 provides for up to 500mA of +5 Volt power to each device. The device requests power in 2mA increments via the MaxPower field in the device’s configuration descriptor. The field is one byte in size and the maximum allowable value is 250 for a total of 500mA requested. More... |
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USB supports interrupt transfers. Interrupt transfers provide a guaranteed maximum latency communication pathway between the host and the USB device. An interrupt IN transfer is an interrupt transfer that is originated at the device and targeted at the host (direction is always referenced as viewed by the host). Interrupt IN transfers can be used by the device to alert the host of an important system event. More... |