Datasheet

PIC18F46J50 Full-Speed USB Demonstration Board User’s Guide

FIGURE 3-3: USB HID BOOTLOADER APPLICATION – NO DEVICE

2. Plug the PIC18F46J50 Full-Speed USB Demonstration Board into a free USB port.

3. Place the board in the Bootloader mode by pressing and holding down the S2

push button (RB2 I/O pin). While still holding down the S2 push button, momen-

tarily press and release the MCLR

push button (S4) to reset the device, keeping

the S2 button depressed until after the device has come out of Reset.

The bootloader firmware performs a quick check of the RB2 I/O pin after coming

out of Reset to determine if the device should enter Bootloader or normal Demo

mode.

As a result:

• The device re-enumerates as a generic HID class device (instead of a composite

HID+MSD device)

• The “USB HID Bootloader” PC application automatically detects the PIC18F46J50

Full-Speed USB Demonstration Board

• The dialog box, shown in Figure 3-4, appears

FIGURE 3-4: USB HID BOOTLOADER APPLICATION – DEVICE FOUND

Once the PC application has found the USB device, the application can be used to

open the Intel

HEX 32-bit formatted *.hex firmware images and program them using

the respective buttons.