AT90USB1287-MUR Atmel, AT90USB1287-MUR Datasheet - Page 49

• Manufacturer Part Number: AT90USB1287-MUR
• Description: MCU AVR 128K FLASH 16MHZ 64QFN
• Manufacturer: Atmel
• Series: AVR® 90USBr

Specifications of AT90USB1287-MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART, USB, USB OTG
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 48
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• Processor Series: AT90USBx
• Core: AVR8
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATSTK525, ATAVRISP2, ATAVRONEKIT, AT90USBKEY, ATEVK525, ATAVRQTOUCHX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.10.2
7593K–AVR–11/09
PLL Control and Status Register – PLLCSR
Figure 6-4.
• Bit 7..5 – Res: Reserved Bits
These bits are reserved bits in the 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.
Table 6-11.
Note:
XTAL1
XTAL2
Bit
$29 ($29)
Read/Write
Initial Value
PLLP2
0
0
0
0
1
1
1
1
1. For AT90USB128x only. Do not use with AT90USB64x.
2. For AT90USB64x only. Do not use with AT90USB128x.
RC OSCILLATOR
8 MHz
OSCILLATORS
0
7
R
PLL Clocking System
PLL input prescaler configurations
PLLP1
0
0
1
1
0
0
1
1
0
6
R
PLLP0
5
R
0
0
1
0
1
0
1
0
1
4
PLLP2
R/W
0
Clock Division
PLL clock
Prescaler
Reserved
Reserved
Reserved
Reserved
Reserved
Factor
8
8
3
PLLP1
R/W
0
4
(1)
(2)
clk
2
PLLP0
R/W
0
2MHz
External XTAL required for USB
AT90USB64/128
System Clock
PLLE
PLL
24x
1
PLLE
R/W
0/1
operation (MHz)
Detector
Lock
0
PLOCK
R/W
0
16
16
8
-
-
-
-
-
(1)
(2)
PLOCK
PLLCSR
(48MHz)
clk USB
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