ATMEGA16U4(2008) 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA16U4
(Rev.:2008)

8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller

Atmel Corporation 

ATmega16U4/ATmega32U4

2.2.11 UVCC

2.2.12 UCAP

2.2.13 VBUS

2.2.14 RESET

2.2.15 XTAL1

2.2.16 XTAL2

2.2.17 AVCC

2.2.18 AREF

USB Pads Internal Regulator Input supply voltage.

USB Pads Internal Regulator Output supply voltage. Should be connected to an external capac-

itor (1µF).

USB VBUS monitor input.

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 8-1 on page

48. Shorter pulses are not guaranteed to generate a reset.

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

Output from the inverting Oscillator amplifier.

AVCC is the supply voltage pin (input) for all the A/D Converter channels. If the ADC is not used,

it should be externally connected to VCC. If the ADC is used, it should be connected to VCC

through a low-pass filter.

This is the analog reference pin (input) for the A/D Converter.

3. About Code Examples

This documentation contains simple code examples that briefly show how to use various parts of

the device. Be aware that not all C compiler vendors include bit definitions in the header files

and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen-

tation for more details.

These code examples assume that the part specific header file is included before compilation.

For I/O registers located in extended I/O map, "IN", "OUT", "SBIS", "SBIC", "CBI", and "SBI"

instructions must be replaced with instructions that allow access to extended I/O. Typically

"LDS" and "STS" combined with "SBRS", "SBRC", "SBR", and "CBR".

7

7766BS–AVR–07/08

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