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ADCREF1 Scheda tecnica(PDF) 8 Page - ATMEL Corporation

Il numero della parte ADCREF1
Spiegazioni elettronici  32-Bit AVR UC3 C Series Schematic Checklist
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ADCREF1 Scheda tecnica(HTML) 8 Page - ATMEL Corporation

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AVR32768
32157A-AVR-12/10
6 Clocks and crystal oscillators
There are three clock inputs available:
• XIN0 / XOUT0
• XIN1 / XOUT1
• XIN32 / XOUT32
The recommendations below refer to XIN / XOUT, but apply to all the clock inputs.
6.1 External clock source
Figure 6-1.
External clock source schematic.
Table 6-1.
External clock source checklist.
Signal name
Recommended pin connection
Description
XIN
Connected to clock output from external clock source
Up to VDDIO-volt square wave signal up to 50MHz
XOUT
Can be left unconnected or used as GPIO
6.2 Crystal oscillator
Figure 6-2.
Crystal oscillator example schematic.
Table 6-2.
Crystal oscillator checklist.
Signal name
Recommended pin connection
Description
XIN
Biasing capacitor, 22pF
(1)(2)
External crystal between 450kHz and 16MHz
XOUT
Biasing capacitor, 22pF
(1)(2)
Notes:
1. These values are given only as a typical example. The capacitance, C, of the biasing capacitors can be computed
based on the crystal load capacitance, CL, and the internal capacitance, Ci, of the MCU as follows:
C = 2(CL – Ci)
The value of CL can be found in the crystal datasheet and the value of Ci can be found in the MCU datasheet
2. Decoupling capacitor should be placed as close as possible to each pin in the signal group, and vias should be
avoided


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