Atmel ATSTK500 500 Starter kit and development system. ATSTK500 ATSTK500 Hoja De Datos

1925C–AVR–3/03

Figure 5-6.  Board

VTARGET controls the operating voltage for the target board. Through the use of the
slide bar or the text box, this voltage can be regulated between 0 and 6.0V in 0.1V incre-
ments. Please refer to the device datasheet to find the specified voltage range for the
selected device. Both voltages are read by pressing the “Read Voltages” button, and
written by pressing the “Write Voltages” button.

The physical connection of the VTARGET voltage is shown in Figure 3-22 on page 3-16.

AREF controls the analog reference voltage for the ADC converter. This setting only
apply to devices with AD converter. Through the use of the slide bar or the text box, this
voltage can be regulated between 0 and 6.0V in 0.1V increments. Please refer to the
device datasheet to find the valid voltage range for the selected device. Both VTARGET
and AREF are read by pressing the “Read Voltages” button, and written by pressing the
“Write Voltages” button.

It is not possible to set AREF to a higher voltage than VTARGET because this will per-
manently damage the AVR.

The physical connection of the AREF voltage is shown in Figure 3-24 on page 3-18.