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AT90USB646 Datasheet(PDF) 49 Page - ATMEL Corporation

Part # AT90USB646
Description  8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  459 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 Datasheet(HTML) 49 Page - ATMEL Corporation

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49
7593H–AVR–11/08
ATmega32U6/AT90USB64/128
Figure 6-4.
PLL Clocking System
6.10.2
PLL Control and Status Register – PLLCSR
• Bit 7..5 – Res: Reserved Bits
These bits are reserved bits in the ATmega32U6/AT90USB64/128 and always read as zero.
• Bit 4..2 – PLLP2:0 PLL Prescaler
These bits allow to configure the PLL input prescaler to generate the 2MHz input clock for the
PLL.
Note:
1. For AT90USB128x only. Do not use with AT90USB64x.
2. For AT90USB64x and ATmega32U6 only. Do not use with AT90USB128x.
8 MHz
RC OSCILLATOR
XTAL1
XTAL2
OSCILLATORS
PLL
24x
PLLE
Lock
Detector
PLOCK
clkUSB
System Clock
clk
2MHz
PLL clock
Prescaler
(48MHz)
Bit
7
65
432
1
0
$29 ($29)
PLLP2
PLLP1
PLLP0
PLLE
PLOCK
PLLCSR
Read/Write
R
R
R
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0/1
0
Table 6-11.
PLL input prescaler configurations
PLLP2
PLLP1
PLLP0
Clock Division
Factor
External XTAL required for USB
operation (MHz)
0
0
0
Reserved
-
0
0
1
Reserved
-
0
1
0
Reserved
-
01
1
4
8
1
0
0
Reserved
-
10
1
8
(1)
16
(1)
11
0
8
(2)
16
(2)
1
1
1
Reserved
-



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