AT32UC3B1256 Atmel Corporation, AT32UC3B1256 Datasheet - Page 5

• Manufacturer Part Number: AT32UC3B1256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3B1256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 60 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 28
• Ext Interrupts: 28
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 6
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Operating Voltage (vcc): 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 10
• Output Compare Channels: 16
• Input Capture Channels: 6
• Pwm Channels: 13
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

6. Inner Workings
6.1 Memory Layout
6.2 Configuration
6.2.1 General-Purpose Fuse Bits
7745C–AVR32–05/09
An AVR UC3 part having the bootloader programmed resets as any other part at 80000000h.
Bootloader execution begins here. The bootloader first performs the boot process to know
whether it should start the USB DFU ISP or the application. If the tested conditions indicate that
the USB DFU ISP should be started, then execution continues in the bootloader area, i.e.
between 80000000h and 80002000h, else the bootloader launches the application at
80002000h.
The conditions tested by the boot process are configured by the general-purpose fuse bits
located outside of the MCU address space and by a 32-bit configuration word located at the end
of the flash User page.
Figure 6-1. AT32UC3A0512 Non-Volatile Memory Layout with USB DFU Bootloader
The bootloader has a configuration which determines the behavior of the boot process and of
the ISP. This configuration is non-volatile and is stored on the one hand in the 32 general-pur-
pose fuse bits and on the other hand in the flash User page (see Figure 6-1).
See the AVR UC3 datasheets referred to by Section 3 for further information about the general-
purpose fuse bits and the flash User page.
The AVR UC3 have 32 general-purpose fuse bits. When these bits are erased, they are at 1b.
The AVR UC3 devices are shipped with:
•
•
•
For AVR UC3 A0, A1: the general-purpose fuses set to FC07FFFFh.
For AVR UC3 A3: the general-purpose fuses set to FFF7FFFFh.
For AVR UC3 B0, B1: the general-purpose fuses set to FC07FFFFh.
configuration word is
32-bit bootloader
Reset vector is
@ 808001FCh
@ 80800000h
@ 80002000h
@ 80000000h
Application is
User page is
MCU Address Space
Free Flash Space
Flash User Page
Application
Bootloader
504 kB
512 B
8 kB
512-kB
Flash
Array
32 GP Fuse
Bits
5