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ATMEGA169V Datasheet(Folha de dados) 6 Page - ATMEL Corporation

Nome de Peças. ATMEGA169V
descrição  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
Download  365 Pages
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Fbricantes  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
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6
ATmega169/V
2514P–AVR–07/06
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 (PG4..PG0)
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
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.
XTAL1
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
XTAL2
Output from the inverting Oscillator amplifier.
AVCC
AVCC is the supply voltage pin for Port F and the A/D Converter. It should be externally
connected to V
CC, even if the ADC is not used. If the ADC is used, it should be con-
nected to V
CC through a low-pass filter.
AREF
This is the analog reference pin for the A/D Converter.
LCDCAP
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 (V
LCD). A large
capacitance reduces ripple on V
LCD but increases the time until VLCD reaches its target
value.
About Code
Examples
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".




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