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ATmega16U4 датащи(PDF) 41 Page - ATMEL Corporation

номер детали ATmega16U4
подробное описание детали  8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
PDF  408 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16U4 датащи(HTML) 41 Page - ATMEL Corporation

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41
7766D–AVR–01/09
ATmega16U4/ATmega32U4
Figure 6-5.
PLL Postcaler operation with division factor = 1.5
• Bit 3..0 – PDIV3:0 PLL Lock Frequency
These bits configure the PLL internal VCO clock reference according to the required output fre-
quency value.
• The optimal PLL configuration at 5V is: PLL output frequency = 96 MHz, divided by 1.5
to generate the 64 MHz High Speed Timer clock, and divided by 2 to generate the 48
MHz USB clock.
PDIV3
PDIV2
PDIV1
PDIV0
PLL Output Frequency
0
0
0
0
Not allowed
0
0
0
1
Not allowed
00
1
0
32 MHz
00
1
1
40 MHz
01
0
0
48 MHz
01
0
1
56 MHz
01
1
0
64 MHz
01
1
1
72 MHz
10
0
0
80 MHz
10
0
1
88 MHz
10
1
0
96 MHz
1
0
1
1
Not allowed
1
1
0
0
Not allowed
1
1
0
1
Not allowed
1
1
1
0
Not allowed
1
1
1
1
Not allowed
Fi
Fi x ---
2
3



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