ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 388

• 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

29.11.1.1
29.11.1.2
8291A–AVR–10/11
Application and Boot Loader Sections
Addressing the Flash
out the program memory code. It has the capability to write into the entire flash, including the
boot loader section. The boot loader can thus modify itself, and it can also erase itself from the
flash if the feature is not needed anymore.
The application and boot loader sections in the flash are different when it comes to self-
programming.
The user signature row section has the same properties as the boot loader section.
Table 29-1.
The Z-pointer is used to hold the flash memory address for read and write access. For more
details on the Z-pointer, refer to
Since the flash is word accessed and organized in pages, the Z-pointer can be treated as having
two sections. The least-significant bits address the words within a page, while the most-signifi-
cant bits address the page within the flash. This is shown in
address in the page (FWORD) is held by the bits [WORDMSB:1] in the Z-pointer. The remaining
bits [PAGEMSB:WORDMSB+1] in the Z-pointer hold the flash page address (FPAGE). Together
FWORD and FPAGE holds an absolute address to a word in the flash.
For flash read operations (ELPM and LPM), one byte is read at a time. For this, the least-signifi-
cant bit (bit 0) in the Z-pointer is used to select the low byte or high byte in the word address. If
this bit is 0, the low byte is read, and if this bit is 1 the high byte is read.
The size of FWORD and FPAGE will depend on the page and flash size in the device. Refer to
each device’s datasheet for details.
Once a programming operation is initiated, the address is latched and the Z-pointer can be
updated and used for other operations.
Section being Addressed during
Programming
Application section
Boot loader section
User signature row section
– When erasing or writing a page located inside the application section, the boot
– When erasing or writing a page located inside the boot loader section, the CPU is
loader section can be read during the operation, and thus the CPU can run and
execute code from the boot loader section
halted during the entire operation, and code cannot execute
Summary of self-programming functionality.
”The X-, Y-, and Z- Registers” on page
Section that can be Read
during Programming
Boot loader section
None
None
Atmel AVR XMEGA B
Figure 29-1 on page
10.
CPU Halted?
No
Yes
Yes
389. The word
388