ATMEGA1284 データシートの表示（PDF） - Atmel Corporation

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ATMEGA1284

8-bit AVR Microcontroller with 16/32/64/128K Bytes In-System Programmable Flash

Atmel Corporation 

164A/164PA/324A/324PA/644A/644PA/1284/1284P

2.3 Pin Descriptions

2.3.1 VCC

2.3.2 GND

Digital supply voltage.

2.3.3

Ground.

Port A (PA7:PA0)

2.3.4

Port A serves as analog inputs to the Analog-to-digital Converter.

Port A also serves as an 8-bit bi-directional I/O port with internal pull-up resistors (selected for

each bit). The Port A output buffers have symmetrical drive characteristics with both high sink

and source capability. As inputs, Port A pins that are externally pulled low will source current if

the pull-up resistors are activated. The Port A pins are tri-stated when a reset condition becomes

active, even if the clock is not running.

Port A also serves the functions of various special features of the

ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 81.

Port B (PB7:PB0)

2.3.5

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.

Port B also serves the functions of various special features of the

ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 83.

Port C (PC7:PC0)

2.3.6

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

ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 86.

Port D (PD7:PD0)

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

ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on page 88.

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8272AS–AVR–01/10

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