AT90USB162 Atmel Corporation, AT90USB162 Datasheet - Page 29

• 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

6.2.5
6.3
6.3.1
6.3.2
7707F–AVR–11/10
Clock Sources
Clock Status Register – CLKSTA
Default Clock Source
Clock Startup Sequence
• Bit 7-2 - Reserved bits
These bits are reserved and will always read as zero.
• Bit 1 – RCON: RC Oscillator On
This bit is set by hardware to one if the RC Oscillator is running.
This bit is set by hardware to zero if the RC Oscillator is stoped.
• Bit 0 – EXTON: External Oscillator / Low Power Oscillator On
This bit is set by hardware to one if the External Oscillator / Low Power Oscillator is running.
This bit is set by hardware to zero if the External Oscillator / Low Power Oscillator is stoped.
The device has the following clock source options, selectable by Flash Fuse bits as shown
below. The clock from the selected source is input to the AVR clock generator, and routed to the
appropriate modules.
Table 6-1.
Note:
The device is shipped with low power crystal oscillator and with the fuse CKDIV8 programmed.
The startup time is set to maximum and time-out period enabled. (CKSEL = "1110", SUT = "01",
CKDIV8 = "0").
Any clock source needs a sufficient V
cycles before it can be considered stable.
To ensure sufficient V
the device reset is released by all other reset sources.
describes the start conditions for the internal reset. The delay (t
Oscillator and the number of cycles in the delay is set by the SUTx and CKSELx fuse bits. The
selectable delays are shown in
Bit
Read/Write
Initial Value
Device Clocking Option
Low Power Crystal Oscillator
Reserved
Reserved
Reserved
Calibrated Internal RC Oscillator
External Clock
Reserved
1. For all fuses “1” means unprogrammed while “0” means programmed.
7
-
R
0
Device Clocking Options Select
CC
6
-
R
0
, the device issues an internal reset with a time-out delay (t
Table
5
-
R
0
CC
6-2. The frequency of the Watchdog Oscillator is voltage
to start oscillating and a minimum number of oscillating
4
-
R
0
(1)
3
-
R
See Bit Description
“On-chip Debug System” on page 45
2
-
R
TOUT
AT90USB82/162
) is timed from the Watchdog
1
RCON
R
1111 - 1000
0111 - 0110
0101 - 0100
0
EXTON
R
CKSEL3..0
0011
0010
0000
0001
TOUT
CLKSTA
) after
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