ATxmega192A3U Atmel Corporation, ATxmega192A3U Datasheet - Page 429

• Manufacturer Part Number: ATxmega192A3U
• Manufacturer: Atmel Corporation

Specifications of ATxmega192A3U

• Flash (kbytes): 192 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 50
• Ext Interrupts: 50
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 10
• Twi (i2c): 2
• Uart: 7
• 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
• Dac Channels: 2
• Dac Resolution (bits): 12
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 16
• 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: 7
• Output Compare Channels: 22
• Input Capture Channels: 22
• Pwm Channels: 22
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

33.6
33.6.1
33.6.2
8331A–AVR–07/11
Flash and EEPROM Page Buffers
Flash Page Buffer
EEPROM Page Buffer
This ensures that the given command is executed and the operations finished before the start of
a new operation. The external programmer or application software must ensure that the NVM is
not addressed when it is busy with a programming operation.
Programming any part of the NVM will automatically block:
During Self-Programming, interrupts must be disabled or the Interrupt Vector table must be
moved to the Boot Loader Sections as described in
Interrupt Controller” on page
The Flash memory is updated page-by-page. The EEPROM can be updated both byte-by-byte
and page-by-page. Flash and EEPROM page programming is done by first filling the associated
page buffer, and then writing the entire page buffer to a selected page in Flash or EEPROM.
The size of the page and page buffers depend on the Flash and EEPROM size in each device,
and details are described the device’s datasheet.
The Flash page buffer is filled one word at a time, and it must be erased before it can be loaded.
If an already loaded location is written again, this will result in a binary AND between the content
of the page buffer location and the word that is loaded. The content of that Flash page buffer
location will be corrupted.
Page buffer locations that are not loaded will have the value 0xFFFF, and this value will then be
programmed into the corresponding flash page locations.
The page buffer is automatically erased after:
The EEPROM page buffer is filled one byte at a time and it must be erased before it can be
loaded. If an already loaded location is written again, this will result in a binary AND between the
content of the page buffer location and the word that is loaded. The content of that EEPROM
page buffer location will be corrupted.
EEPROM page buffer locations that are loaded will get tagged by the NVM Controller. During a
page write or page erase, only targed locations will be written or erased. Locations that are not
targed, will not be written or erased, and the corresponding EEPROM location will remain
unchanged. This means that before an EEPROM page erase, data must be loaded to the
selected page buffer location to tag them. When performing an EEPROM page erase the actual
value of the tagged location does not matter.
• All programming to other parts of the NVM.
• All loading/erasing of the Flash and EEPROM Page Buffers.
• All NVM read from external programmers.
• All NVM read from the Application Section.
• A device reset.
• Executing the Write Flash Page command.
• Executing the Erase and Write Flash Page command.
• Executing the Signature Row write command.
• Executing the Write Lock Bit command.
132.
Atmel AVR XMEGA AU
”Interrupts and Programmable Multilevel
429