STK521 Datasheet, PDF (11/22 Pages) ATMEL Corporation – Atmel AVR STK521 is a new member of the successful Atmel STK500 starter kit family

2.5 Atmel STK521 switches configuration
The switches shown in Figure 2-6 are described in Table 2-5 .
Figure 2-6. STK521 switches.
Table 2-5. STK521 switches description.
Switches
Function
CLOCK
Clock source selection
RESET
POWER
Reset pin configuration
Power supply source
selection
Description
EXT: clock from crystal plugged in Ext Clock socket
STK500: clock from Atmel STK500
INT RC: clock from internal RC oscillator
RST/: Product reset pin is connected to STK500 reset button
PE0: Product reset pin is connected to PE0 on PORTE header
VEXT: External power supply through power jack
VTG: STK500 power supply through expansion header
STK521 User Guide
2-9
8194B–AVR–01/12