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AT90USB647-16AU Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT90USB647-16AU Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 434 page  8 7593A–AVR–02/06 AT90USB64/128 2.2.9 D- USB Full speed / Low Speed Negative Data Upstream Port. 2.2.10 D+ USB Full speed / Low Speed Positive Data Upstream Port. 2.2.11 UGND USB Ground. 2.2.12 UVCC USB Pads Internal Regulator Input supply voltage. 2.2.13 UCAP USB Pads Internal Regulator Output supply voltage. Should be connected to an external capac- itor (1µF). 2.2.14 VBUS USB VBUS monitor and OTG negociations. 2.2.15 RESET 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 59. Shorter pulses are not guaranteed to generate a reset. 2.2.16 XTAL1 Input to the inverting Oscillator amplifier and input to the internal clock operating circuit. 2.2.17 XTAL2 Output from the inverting Oscillator amplifier. 2.2.18 AVCC AVCC is the supply voltage pin for Port F and the A/D Converter. It should be externally con- nected to V CC, even if the ADC is not used. If the ADC is used, it should be connected to VCC through a low-pass filter. 2.2.19 AREF This is the analog reference pin 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". |
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