ATMEGA406(2005) 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA406
(Rev.:2005)

8-bit Microcontroller with 40K Bytes In-System Programmable Flash

Atmel Corporation 

ATmega406

2.2 Pin Descriptions

2.2.1 VFET

Input to the internal voltage regulator.

2.2.2 VCC

Digital supply voltage. Normally connected to VREG.

2.2.3 VREG

Output from the internal voltage regulator.

2.2.4 VREF

Internal Voltage Reference for external decoupling.

2.2.5

VREFGND

Ground for decoupling of Internal Voltage Reference.

2.2.6 GND

Ground

2.2.7 SGND

Signal Ground.

2.2.8

Port A (PA7:PA0)

PA3:PA0 serves as the analog inputs to the Voltage A/D Converter.

Port A also serves as a low-voltage 8-bit bi-directional I/O port with internal pull-up resistors

(selected for each bit). 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 ATmega406 as listed in ”Alter-

nate Functions of Port A” on page 69.

2.2.9

Port B (PB7:PB0)

Port B is a low-voltage 8-bit bi-directional I/O port with internal pull-up resistors (selected for

each bit). 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 ATmega406 as listed in ”Alter-

nate Functions of Port B” on page 71.

2.2.10

Port C (PC0)

Port C is a high voltage Open Drain output port.

2.2.11

Port D (PD1:PD0)

Port D is a low-voltage 2-bit bi-directional I/O port with internal pull-up resistors (selected for

each bit). As inputs, Port D pins that are externally pulled low will source current if the pull-up

5

2548AS–AVR–01/05

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