ATMEGA169 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA169

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

Atmel Corporation 

Port G (PG4..PG0)

RESET

XTAL1

XTAL2

AVCC

AREF

LCDCAP

About Code

Examples

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 70.

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 98. 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.

This documentation contains simple code examples that briefly show how to use various

parts of the device. Be aware that not all C compiler vendors include bit definitions in the

header files and interrupt handling in C is compiler dependent. Please confirm with the

C compiler documentation for more details.

These code examples assume that the part specific header file is included before com-

pilation. For I/O registers located in extended I/O map, "IN", "OUT", "SBIS", "SBIC",

"CBI", and "SBI" instructions must be replaced with instructions that allow access to

extended I/O. Typically "LDS" and "STS" combined with "SBRS", "SBRC", "SBR", and

"CBR".

6 ATmega169/V

2514P–AVR–07/06

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