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AT90USB646 Datasheet(PDF) 49 Page - ATMEL Corporation

No. de pieza AT90USB646
Descripción Electrónicos  Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  434 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 49 Page - ATMEL Corporation

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7593A–AVR–02/06
AT90USB64/128
6.11 PLL
The PLL is used to generate internal high frequency (48 MHz) clock for USB interface, the PLL
input is generated from an external low-frequency (the crystal oscillator or external clock input
pin from XTAL1).
6.11.1
Internal PLL for USB interface
The internal PLL in AT90USB64/128 generates a clock frequency that is 24x multiplied from
nominally 2 MHz input. The source of the 2 MHz PLL input clock is the output of the internal PLL
clock prescaler that generates the 2 MHz (See Section 6.11.2 for PLL interface).
Table 6-12.
Clock Prescaler Select
CLKPS3
CLKPS2
CLKPS1
CLKPS0
Clock Division Factor
0000
1
0001
2
0010
4
0011
8
0100
16
0101
32
0110
64
0111
128
1000
256
1001
Reserved
1010
Reserved
1011
Reserved
1100
Reserved
1101
Reserved
1110
Reserved
1111
Reserved



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