ATxmega128A4U Atmel Corporation, ATxmega128A4U Datasheet - Page 427

• Manufacturer Part Number: ATxmega128A4U
• Manufacturer: Atmel Corporation

Specifications of ATxmega128A4U

• Flash (kbytes): 128 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 34
• Ext Interrupts: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 7
• Twi (i2c): 2
• Uart: 5
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 2
• Resistive Touch Screen: No
• Dac Channels: 2
• Dac Resolution (bits): 12
• 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: 5
• Output Compare Channels: 16
• Input Capture Channels: 16
• Pwm Channels: 16
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

33. Memory Programming
33.1
33.2
8331A–AVR–07/11
Features
Overview
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This section describes how to program the Non Volatile Memory (NVM) in XMEGA, and covers
both self-programming and external programming. The NVM consists of the Flash Program
Memory, User Signature and Calibration rows, Fuses and Lock Bits, and EEPROM data mem-
ory. For details on the actual memories, how they are organized and the register description for
the NVM Controller used to access the memories, refer to
The NVM can be accessed for read and write both from application software through self-pro-
gramming and from an external programmer. Accessing the NVM is done through the NVM
Controller, and the two methods of programming are similar. Memory access is done by loading
address and/or data to the NVM or NVM Controller, and using a set of commands and triggers
that make the NVM Controller perform specific tasks on the NVM.
From external programming all memory spaces can be read and written, except for the Produc-
tion Signature row which can only be read. The device can be programmed in-system and is
accessed through the PDI using the PDI or JTAG physical interfaces,
on page 443
Self-programming and Boot Loader support allows application software in the device to read and
write the Flash, User Signature row and EEPROM, write the Lock Bits to a more secure setting,
and read the Production Signature row and Fuses. The Flash allows Read-While-Write self-pro-
gramming meaning that the CPU can continue to operate and execute code while the Flash is
being programmed.
detail.
For both self-programming and external programming it is possible to run a CRC check on the
Flash or a section of the Flash to verify its content after programming.
Read and Write access to all memory spaces from
Self-Programming and Boot Loader Support
External Programming
High Security with Separate Boot Lock Bits for
Reset Fuse to Select Reset Vector address to the start of the
– External programmers
– Application Software Self-Programming
– Read-While-Write Self-Programming
– CPU can run and execute code while Flash is being programmed
– Any communication interface can be used for program upload/download
– Support for in-system and production programming
– Programming through serial PDI or JTAG interface
– External programming access
– Boot Loader Section access
– Application Section access
– Application Table access
– Application Section, or
– Boot Loader Section
describes PDI and JTAG in detail.
”Self-Programming and Boot Loader Support” on page 432
Atmel AVR XMEGA AU
”Memories” on page
”External Programming”
19.
describes this in
427