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ATMEGA32-16AU 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
TQFP-44
描述:
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ATMEGA32-16AU数据手册
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ATmega16U4/32U4 [DATASHEET SUMMARY]
Atmel-7766IS-USB-ATmega16U4/32U4-Datasheet_Summary_072015
6
Port D also serves the functions of various special features of the ATmega16U4/ATmega32U4 as listed on
page 78.
2.2.6 Port E (PE6,PE2)
Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port E output
buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port E pins
that are externally pulled low will source current if the pull-up resistors are activated. The Port E pins are tri-
stated when a reset condition becomes active, even if the clock is not running.
Only bits 2 and 6 are present on the product pinout.
Port E also serves the functions of various special features of the ATmega16U4/ATmega32U4 as listed on
page 81.
2.2.7 Port F (PF7..PF4, PF1,PF0)
Port F serves as analog inputs to the A/D Converter.
Port F also serves as an 8-bit bi-directional I/O port, if the A/D Converter channels are not used. Port pins can
provide internal pull-up resistors (selected for each bit). The Port F output buffers have symmetrical drive
characteristics with both high sink and source capability. As inputs, Port F pins that are externally pulled low will
source current if the pull-up resistors are activated. The Port F pins are tri-stated when a reset condition
becomes active, even if the clock is not running.
Bits 2 and 3 are not present on the product pinout.
Port F also serves the functions of the JTAG interface. If the JTAG interface is enabled, the pull-up resistors on
pins PF7(TDI), PF5(TMS), and PF4(TCK) will be activated even if a reset occurs.
2.2.8 D-
USB Full speed / Low Speed Negative Data Upstream Port. Should be connected to the USB D- connector pin
with a serial 22 resistor.
2.2.9 D+
USB Full speed / Low Speed Positive Data Upstream Port. Should be connected to the USB D+ connector pin
with a serial 22 resistor.
2.2.10 UGND
USB Pads Ground.
2.2.11 UVCC
USB Pads Internal Regulator Input supply voltage.
2.2.12 UCAP
USB Pads Internal Regulator Output supply voltage. Should be connected to an external capacitor (1µF).
2.2.13 VBUS
USB VBUS monitor input.
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