AT32UC3A3256 Atmel Corporation, AT32UC3A3256 Datasheet - Page 623

• Manufacturer Part Number: AT32UC3A3256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A3256

• Flash (kbytes): 256 Kbytes
• Pin Count: 144
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 110
• Ext Interrupts: 110
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Ssc: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 16
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 12
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26.7
26.7.1
26.7.1.1
26.7.1.2
32072G–11/2011
Functional Description
USB General Operation
Introduction
Power-On and reset
After a hardware reset, the USBB is disabled. When enabled, the USBB runs either in device
mode or in host mode according to the ID detection.
If the USB_ID pin is not connected to ground, the USB_ID Pin State bit in the General Status
register (USBSTA.ID) is set (the internal pull-up resistor of the USB_ID pin must be enabled by
the I/O Controller) and device mode is engaged.
The USBSTA.ID bit is cleared when a low level has been detected on the USB_ID pin. Host
mode is then engaged.
Figure 26-5 on page 623
Figure 26-5. General States
After a hardware reset, the USBB is in the Reset state. In this state:
• The macro is disabled. The USBB Enable bit in the General Control register
• The macro clock is stopped in order to minimize power consumption. The Freeze USB Clock
• The UTMI is in suspend mode.
• The internal states and registers of the device and host modes are reset.
• The DPRAM is not cleared and is accessible.
• The USBSTA.ID bit and the VBus Level bit in the UBSTA (UBSTA.VBUS) reflect the states of
• The OTG Pad Enable (OTGPADE) bit, the VBus Polarity (VBUSPO) bit, the FRZCLK bit, the
(USBCON.USBE) is zero.
bit in USBCON (USBON.FRZCLK) is set.
the USB_ID and USB_VBUS input pins.
USBE bit, the USB_ID Pin Enable (UIDE) bit, the USBB Mode (UIMOD) bit in USBCON, and
the Low-Speed Mode Force bit in the Device General Control (UDCON.LS) register can be
written by software, so that the user can program pads and speed before enabling the macro,
but their value is only taken into account once the macro is enabled and unfrozen.
describes the USBB main states.
Clock stopped:
FRZCLK = 1
Device
Macro off:
USBE = 0
USBE = 1
ID = 1
USBE = 0
Reset
USBE = 1
ID = 0
USBE = 0
USBE = 0
Host
RESET
HW
<any
other
state>
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