ATxmega256A3BU Atmel Corporation, ATxmega256A3BU Datasheet - Page 15

• Manufacturer Part Number: ATxmega256A3BU
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3BU

• Flash (kbytes): 256 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: 47
• Ext Interrupts: 49
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 8
• Twi (i2c): 2
• Uart: 6
• 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): 4096
• 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

3.14.4
3.14.5
3.14.6
8331A–AVR–07/11
RAMPY – Extended Y-Pointer Register
RAMPZ – Extended Z-Pointer Register
EIND – Extended Indirect Register
• Bit 7:0 – RAMPX[7:0]: Extended X-pointer Address bits
These bits hold the MSB of the 24-bit address created by RAMPX and the 16-bit X-register. Only
the number of bits required to address the available data memory is implemented for each
device. Unused bits will always read as zero.
This register is concatenated with the Y-register for indirect addressing (LD/LDD/ST/STD) of the
whole data memory space on devices with more than 64KB of data memory. This register is not
available if the data memory, including external memory, is less than 64KB.
• Bit 7:0 – RAMPY[7:0]: Extended Y-pointer Address bits
These bits hold the MSB of the 24-bit address created by RAMPY and the 16-bit Y-register. Only
the number of bits required to address the available data memory is implemented for each
device. Unused bits will always read as zero.
This register is concatenated with the Z-register for indirect addressing (LD/LDD/ST/STD) of the
whole data memory space on devices with more than 64KB of data memory. RAMPZ is concat-
enated with the Z-register when reading (ELPM) program memory locations above the first 64KB
and writing (SPM) program memory locations above the first 128KB of the program memory.
This register is not available if the data memory, including external memory and program mem-
ory in the device, is less than 64KB.
• Bit 7:0 – RAMPZ[7:0]: Extended Z-pointer Address bits
These bits hold the MSB of the 24-bit address created by RAMPZ and the 16-bit Z-register. Only
the number of bits required to address the available data and program memory is implemented
for each device. Unused bits will always read as zero.
This register is concatenated with the Z-register for enabling extended indirect jump (EIJMP)
and call (EICALL) to the whole program memory space on devices with more than 128KB of pro-
gram memory. The register should be used for jumps to addresses below 128KB if
Bit
+0x0B
Read/Write
Initial Value
Bit
+0x0A
Read/Write
Initial Value
Bit
+0x09
Read/Write
Initial Value
R/W
R/W
R/W
7
0
7
0
7
0
R/W
R/W
R/W
6
0
6
0
6
0
R/W
R/W
R/W
5
0
5
0
5
0
R/W
R/W
R/W
4
0
4
0
4
0
RAMPX[7:0]
RAMPY[7:0]
RAMPZ[7:0]
R/W
R/W
R/W
Atmel AVR XMEGA AU
3
0
3
0
3
0
R/W
R/W
R/W
2
0
2
0
2
0
R/W
R/W
R/W
1
0
1
0
1
0
R/W
R/W
R/W
0
0
0
0
0
0
RAMPX
RAMPY
RAMPZ
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