Datasheet
7
ATmega128(L)
2467AS–08/01
XTAL2 Output from the inverting oscillator amplifier.
AVCC This is the supply voltage pin for Port F and the A/D Converter. It should be externally
connected to VCC, even if the ADC is not used. If the ADC is used, it should be con-
nected to VCC through a low-pass filter.
AREF This is the analog reference pin for the A/D Converter.
PEN This is a programming enable pin for the serial programming mode. By holding this pin
low during a power-on reset, the device will enter the serial programming mode. PEN
has no function during normal operation.