Communication for 18，based on HID mode to send 2 bytes.

4550-USB\18f4550.err
........\4550-usb.c
........\4550-usb.err
........\4550-usb.h
........\4550-usb.lst
........\4550-usb.o
........\4550-usbsetup.c
........\4550-usbsetup.o
........\com.cof
........\com.hex
........\com.map
........\com.mcp
........\com.mcs
........\com.mcw
........\com.mptags
........\com.tagsrc
........\main.c
........\main.o
........\Makefile
........\NMakefile
........\option.h
........\option.o
........\rm18f4550.err
........\rm18f4550.lkr
........\typedefint.h
........\uart.c
........\uart.o
........\usb.h
........\USB.HEX
........\usb.pjt
........\usb_ch9.c
........\usb_main.c
4550-USB

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