Keil MCB167-NET, User Manual

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12 Chapter 2. Setup
VAREF, VAGND: Default ON
This configuration jumpers provide the reference voltage for the A/D converter.
When you set this jumpers to off, you may supply an user provided reference
voltage.
VPP: Default OFF
VPP provides the flash programming voltage for some devices. In some device
variants. On some device variants this jumpers might be used to disable the
oscillator watchdog. For detailed information about the usage of this jumper
refer to the description of pin 84 in chip datasheet of the device used on the
board.