AT90USB162 Atmel Corporation, AT90USB162 Datasheet - Page 32

• Manufacturer Part Number: AT90USB162
• Manufacturer: Atmel Corporation

Specifications of AT90USB162

• Flash (kbytes): 16 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 21
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

6.5
32
Calibrated Internal RC Oscillator
AT90USB82/162
Table 6-4.
Notes:
Table 6-5.
Note:
The calibrated internal RC Oscillator by default provides a 8.0 MHz clock. The fre-
quency is nominal value at 3.0V and 25°C. At 3.0V and 25°C, this calibration gives a
frequency of 8 MHz ± 10%. The device is shipped with the CKDIV8 Fuse programmed.
See
as the system clock by programming the CKSEL Fuses as shown in
selected, it will operate with no external components. During reset, hardware loads the
calibration byte into the OSCCAL Register and thereby automatically calibrates the RC
Oscillator. At 3.3V and 25⋅C, this calibration gives a frequency of 8 MHz ± 1%. The
oscillator can be calibrated to any frequency in the range 7.3 - 8.1 MHz within ±1%
accuracy, by changing the OSCCAL register. When this Oscillator is used as the chip
clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for the
Reset Time-out. For more information on the pre-programmed calibration value, see the
section
Table 6-6.
Notes:
Oscillator Source /
Power Conditions
Crystal Oscillator, BOD
enabled
Crystal Oscillator, fast
rising power
Crystal Oscillator, slowly
rising power
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
“System Clock Prescaler” on page 34
1. These options should only be used when not operating close to the maximum frequency of the
2. These options are intended for use with ceramic resonators and will ensure frequency stability
1.
1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values. Actual values are TBD.
“Calibration Byte” on page 246
device, and only if frequency stability at start-up is not important for the application. These
options are not suitable for crystals.
at start-up. They can also be used with crystals when not operating close to the maximum fre-
quency of the device, and if frequency stability at start-up is not important for the application.
The device is shipped with this option selected.
Start-up Times for the Low Power Crystal Oscillator Clock Selection (Continued)
Start-up times for the internal calibrated RC Oscillator clock selection
Internal Calibrated RC Oscillator Operating Modes
Frequency Range
7.3 - 8.1
Start-up Time from
Start-up Time from Power-
Power-down and
down and Power-save
Power-save
(2)
16K CK
16K CK
16K CK
(MHz)
Reserved
6 CK
6 CK
6 CK
for more details. This clock may be selected
Additional Delay
14CK + 4.1 ms
14CK + 65 ms
(V
from Reset
CC
14CK
= 5.0V)
Additional Delay from
Reset (V
14CK + 65 ms
14CK + 4.1 ms
(1)(3)
14CK
CC
CKSEL3..0
= 5.0V)
CLKSEL
0010
(1)
0
1
1
1
Table
7707F–AVR–11/10
SUT1..0
SUT1..0
6-6. If
01
10
11
00
01
10
11