ATxmega256A3B Atmel Corporation, ATxmega256A3B Datasheet - Page 277

• Manufacturer Part Number: ATxmega256A3B
• Manufacturer: Atmel Corporation

Specifications of ATxmega256A3B

• 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 Speed: No
• Usb Interface: No
• 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

24.10 EBI Timing
(See
24.10.1
Table 24-4.
Note:
8077H–AVR–12/09
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
CLKPER2
ALH
ALS
ALW
ARH
AWH
ARS
AWS
DRH
DRS
DWH
DWS
RW
WW
CH
CRS
CWS
Section 33. ”Appendix A: EBI Timing Diagrams” on page
1. For characterization of Clk
SRAM
Parameter
Clock period
Address Hold after ALE Low
Address Setup before ALE low (read and write)
ALE Width
Address Hold after RE high
Address Hold after WE high
Address Setup before RE high
Address Setup before WE low
Data Hold after RE high
Data Setup to RE high
Data Hold after WE high
Data Setup to WE high
Read Enable Pulse width
Write Enable Pulse width
Chip Select hold after RE/WE high
Chip Select setup to RE low or ALE high
Chip Select setup to WE low
EBI SRAM Characteristics
SYS
and t
(1)
DRS
refer to device data sheet
Min
2 x Clk
0
TBD
392)
SYS
t
t
t
t
t
t
t
t
t
t
t
t
0
t
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
CLKPER2
Typical
x SRWS
x SRWS
Max
XMEGA A
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
277