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ATMEGA163 Datasheet(PDF) 5 Page - ATMEL Corporation

Part No. ATMEGA163
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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5
ATmega163(L)
1142E–AVR–02/03
Port C also serves the functions of various special features of the ATmega163 as listed
on page 124.
Port D (PD7..PD0)
Port D is an 8-bit bidirectional I/O port with internal pull-up resistors (selected for each
bit). The Port D output buffers can sink 20 mA. As inputs, Port D pins that are externally
pulled low will source current if the pull-up resistors are activated. Port D also serves the
functions of various special features of the ATmega163 as listed on page 128. The Port
D pins are tristated when a reset condition becomes active, even if the clock is not
running.
RESET
Reset input. A low level on this pin for more than 500 ns will generate a Reset, even if
the clock is not running. 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
This is the supply voltage pin for Port A 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. See page 105 for details on operation of the
ADC.
AREF
AREF is the analog reference input pin for the A/D Converter. For ADC operations, a
voltage in the range 2.5V to AVCC can be applied to this pin.
AGND
Analog ground. If the board has a separate analog ground plane, this pin should be con-
nected to this ground plane. Otherwise, connect to GND.
Clock Options
The device has the following clock source options, selectable by Flash Fuse bits as
shown:
Note:
1. “1” means unprogrammed, “0” means programmed.
The various choices for each clocking option give different start-up times as shown in
Table 5 on page 25.
Internal RC Oscillator
The internal RC Oscillator option is an On-chip Oscillator running at a fixed frequency of
nominally 1 MHz. If selected, the device can operate with no external components. The
device is shipped with this option selected. See “EEPROM Read/Write Access” on page
62 for information on calibrating this Oscillator.
Table 1. Device Clocking Options Select(1)
Device Clocking Option
CKSEL3..0
External Crystal/Ceramic Resonator
1111 - 1010
External Low-frequency Crystal
1001 - 1000
External RC Oscillator
0111 - 0101
Internal RC Oscillator
0100 - 0010
External Clock
0001 - 0000




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