ATMEGA169-16MISL709 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA169-16MISL709

8-bit Microcontroller with 16K Bytes In-System Programmable Flash

Atmel Corporation 

Port G (PG4..PG0)

RESET

XTAL1

XTAL2

AVCC

AREF

LCDCAP

buffers have symmetrical drive characteristics with both high sink and source capability.

As inputs, Port F pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port F pins are tri-stated when a reset condition becomes

active, even if the clock is not running. If the JTAG interface is enabled, the pull-up resis-

tors on pins PF7(TDI), PF5(TMS), and PF4(TCK) will be activated even if a reset

occurs.

Port F also serves the functions of the JTAG interface.

Port G is a 5-bit bi-directional I/O port with internal pull-up resistors (selected for each

bit). The Port G output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port G pins that are externally pulled low will source

current if the pull-up resistors are activated. The Port G pins are tri-stated when a reset

condition becomes active, even if the clock is not running.

Port G also serves the functions of various special features of the ATmega169 as listed

on page 68.

Reset input. A low level on this pin for longer than the minimum pulse length will gener-

ate a reset, even if the clock is not running. The minimum pulse length is given in Table

16 on page 38. Shorter pulses are not guaranteed to generate a reset.

Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.

Output from the inverting Oscillator amplifier.

AVCC 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.

An external capacitor (typical > 470 nF) must be connected to the LCDCAP pin as

shown in Figure 97. This capacitor acts as a reservoir for LCD power (VLCD). A large

capacitance reduces ripple on VLCD but increases the time until VLCD reaches its target

value.

6 ATmega169/V

2514KS–AVR–05/04

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