ATxmega256A3 Atmel Corporation, ATxmega256A3 Datasheet - Page 360

• Manufacturer Part Number: ATxmega256A3
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3

• 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: 50
• Ext Interrupts: 50
• Usb Speed: No
• Usb Interface: No
• 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): 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

8077H–AVR–12/09
• Bit 2:0 - GUARDTIME[2:0]: Guard Time
These bits specify the number of additional IDLE bits of Guard Time that are inserted in between
PDI reception and - transmission direction change. The default Guard Time is 128 IDLE bits,
and the available settings is shown in
nication, the Guard Time should be set to the lowest safe configuration accepted. It should be
noted that no Guard Time is inserted when switching from TX - to RX mode.
Table 29-3.
Guard Time settings.
GUARDTIME
000
001
010
011
100
101
110
111
Table 29-3 on page
360. In order to speed up the commu-
Number of IDLE bits
+128
+64
+32
+16
+8
+4
+2
+0
XMEGA A
360