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ATMEGA328P 데이터시트(PDF) 4 Page - ATMEL Corporation

부품명 ATMEGA328P
상세설명  8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash
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제조업체  ATMEL [ATMEL Corporation]
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ATmega328P [DATASHEET]
7810D–AVR–01/15
4
1.1
Pin Descriptions
1.1.1
VCC
Digital supply voltage.
1.1.2
GND
Ground.
1.1.3
Port B (PB7:0) XTAL1/XTAL2/TOSC1/TOSC2
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have
symmetrical drive characteristics with both high sink and source capability. As inputs, port B pins that are externally pulled
low will source current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset condition becomes
active, even if the clock is not running.
Depending on the clock selection fuse settings, PB6 can be used as input to the inverting oscillator amplifier and input to the
internal clock operating circuit.
Depending on the clock selection fuse settings, PB7 can be used as output from the inverting oscillator amplifier.
If the internal calibrated RC oscillator is used as chip clock source, PB7..6 is used as TOSC2..1 input for the asynchronous
Timer/Counter2 if the AS2 bit in ASSR is set.
The various special features of port B are elaborated in Section 13.3.1 “Alternate Functions of Port B” on page 65 and
Section 8. “System Clock and Clock Options” on page 24.
1.1.4
Port C (PC5:0)
Port C is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The PC5..0 output buffers have
symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled
low will source current if the pull-up resistors are activated. The port C pins are tri-stated when a reset condition becomes
active, even if the clock is not running.
1.1.5
PC6/RESET
If the RSTDISBL fuse is programmed, PC6 is used as an input pin. If the RSTDISBL fuse is unprogrammed, PC6 is used as
a reset input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not
running. The minimum pulse length is given in Table 28-4 on page 261. Shorter pulses are not guaranteed to generate a
reset.
The various special features of port C are elaborated in Section 13.3.2 “Alternate Functions of Port C” on page 68.
1.1.6
Port D (PD7:0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The port D output buffers have
symmetrical drive characteristics with both high sink and source capability. As inputs, port D pins that are externally pulled
low will source current if the pull-up resistors are activated. The port D pins are tri-stated when a reset condition becomes
active, even if the clock is not running.
The various special features of port D are elaborated in Section 13.3.3 “Alternate Functions of Port D” on page 70.
1.1.7
AV
CC
AVCC is the supply voltage pin for the A/D converter, PC3:0, and ADC7:6. It should be externally connected to VCC, even if
the ADC is not used. If the ADC is used, it should be connected to VCC through a low-pass filter. Note that PC6..4 use digital
supply voltage, VCC.
1.1.8
AREF
AREF is the analog reference pin for the A/D converter.


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