ATMEGA324P-A15MZ 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA324P-A15MZ

8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash

Atmel Corporation 

2.3.5

2.3.6

2.3.7

2.3.8

2.3.9

2.3.10

2.3.11

Port C (PC7:PC0)

Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port C 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.

Port C also serves the functions of the JTAG interface, along with special features of the

ATmega164P/324P/644P as listed on page 84.

Port D (PD7:PD0)

RESET

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.

Port D also serves the functions of various special features of the ATmega164P/324P/644P as

listed on page 86.

XTAL1

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 “System and Reset

Characteristics” on page 332. Shorter pulses are not guaranteed to generate a reset.

XTAL2

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

AVCC

Output from the inverting Oscillator amplifier.

AREF

AVCC is the supply voltage pin for Port F and the Analog-to-digital Converter. It should be exter-

nally 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.

This is the analog reference pin for the Analog-to-digital Converter.

6 ATmega164P/324P/644P

7674F–AVR–09/09

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