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ATmega32U2 Datasheet(PDF) 41 Page - ATMEL Corporation

Part # ATmega32U2
Description  8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller
PDF  314 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega32U2 Datasheet(HTML) 41 Page - ATMEL Corporation

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7799B–AVR–07/09
ATmega8U2/16U2/32U2
• Bit 1 – PLLE: PLL Enable
When the PLLE is set, the PLL is started. Note that the Calibrated 8 MHz Internal RC oscillator is
automatically enabled when the PLLE bit is set and with PINMUX (see PLLFRQ register) is set.
The PLL must be disabled before entering Power down mode in order to stop Internal RC Oscil-
lator and avoid extra-consumption.
• Bit 0 – PLOCK: PLL Lock Detector
When the PLOCK bit is set, the PLL is locked to the reference clock. After the PLL is enabled, it
takes about several ms for the PLL to lock. To clear PLOCK, clear PLLE.



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