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ADCREF1 Folha de dados(PDF) 8 Page - ATMEL Corporation |
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ADCREF1 Folha de dados(HTML) 8 Page - ATMEL Corporation |
8 / 30 page 8 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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