ATMEGA128-8AI ATMEL Corporation, ATMEGA128-8AI Datasheet - Page 7

• Manufacturer Part Number: ATMEGA128-8AI
• Description: 8-bit Microcontroller with 128K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

XTAL2
AVCC
AREF
PEN
2467AS–08/01
Output from the inverting oscillator amplifier.
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.
This is the analog reference pin for the A/D Converter.
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.
ATmega128(L)
7