Page 132 of 229 Start Back Next End ZBasic Language Reference 122 ZBasic Microcontrollers The easiest way to build a bootloader image is to use the batchfile makeboot.bat. Near the beginning of that file you’ll find several configuration items including the operating frequency (F_CPU), the download baud rate (BAUD) and the target device (DEVICE). For xmega devices, you’ll need to set BAUD_SEL to select the baud rate; BAUD and F_CPU aren’t used in that case. After making the desired changes, run the batchfile to effect the build; the resulting .hex file containing the bootloader will then be found in the boot subdirectory in a file named for the device, e.g. zboot\boot\atmega644p_boot.hex for the ATmega644P.