ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 20

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

4.3.1
4.3.2
4.3.3
8291A–AVR–10/11
Application Section
Application Table Section
Boot Loader Section
All AVR CPU instructions are 16 or 32 bit wide, and each flash location is 16 bits wide. The flash
memory is organized in two main sections, the application section and the boot loader section,
as shown in
dependent. These two sections have separate lock bits, and can have different levels of protec-
tion. The store program memory (SPM) instruction,used to write to the flash from the application
software, will only operate when executed from the boot loader section.
The application section contains an application table section with separate lock settings. This
enables safe storage of nonvolatile data in the program memory.
Figure 4-1.
The Application section is the section of the flash that is used for storing the executable applica-
tion code. The protection level for the application section can be selected by the boot lock bits
for this section. The application section can not store any boot loader code since the SPM
instruction cannot be executed from the application section.
The application table section is a part of the application section of the flash memory that can be
used for storing data. The size is identical to the boot loader section. The protection level for the
application table section can be selected by the boot lock bits for this section. The possibilities
for different protection levels on the application section and the application table section enable
safe parameter storage in the program memory. If this section is not used for data, application
code can reside here.
While the application section is used for storing the application code, the boot loader software
must be located in the boot loader section because the SPM instruction can initiate program-
Figure 4-1 on page
Flash memory sections.
Boot Loader Flash
Application Flash
Application Table
20. The sizes of the different sections are fixed, but device-
Flash Section
Section
Section
0x000000
End Application
Start Boot Loader
Flashend
Atmel AVR XMEGA B
20