ATXMEGA256A3B-MH Atmel, ATXMEGA256A3B-MH Datasheet - Page 274

• Manufacturer Part Number: ATXMEGA256A3B-MH
• Description: MCU AVR 256KB FLASH A3B 64-QFN
• Manufacturer: Atmel
• Series: AVR® XMEGAr

Specifications of ATXMEGA256A3B-MH

• Core Processor: AVR
• Core Size: 8/16-Bit
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 49
• Program Memory Size: 256KB (128K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 3.6 V
• Data Converters: A/D 16x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Processor Series: ATXMEGA256x
• Core: AVR8
• Data Bus Width: 8 bit, 16 bit
• Data Ram Size: 16 KB
• Interface Type: I2C, SPI, USART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 49
• Number Of Timers: 7
• Operating Supply Voltage: 1.6 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 12 bit, 8 Channel
• On-chip Dac: 12 bit, 2 Channel
• For Use With: ATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATXMEGA256A3B-MU; ATXMEGA256A3B-MU

24.8.1
24.8.2
24.8.3
8077H–AVR–12/09
Supported Commands
3-Port EBI Configuration
4-Port EBI Configuration
The SDRAM commands that are supported by the EBI is listed in
Table 24-3.
When 3 EBI ports are available, SDRAM can be connected with 3-Port EBI configuration. When
this is done only 4-bit data bus is available, and any chip select must be controlled from software
using a general purpose I/O pin (Pxn).
Figure 24-8. 3-Port SDRAM configuration
When 4 EBI ports are available, SDRAM can be connected with 3-Port or 4-Port EBI configura-
tion. When 4-Port configuration is used, 8-bit data bus is available and all four chip selects will
be available.
Command
NOP
ACTIVE
READ
WRITE
PRECHARGE
AUTO REFRESH
LOAD MODE
SELF REFRESH
Supported SDRAM commands
EBI
Description
No Operation
Activate the selected bank and select the row.
Input the starting column address and begin the burst read operation.
Input the starting column address and begin the burst write operation.
Deactivate the open row of selected bank or all banks
Refresh one row of each bank
Activate self refresh mode
CAS/RE
BA[1:0]
A[11:8]
A[7:0]]
D[3:0]
DQM
CKE
RAS
CLK
Pxn
WE
CLK
CKE
BA[1:0]
DQM
WE
RAS
CAS
D[3:0]
A[7:0]
A[11:8]
CS
Table 24-3 on page
SDRAM
XMEGA A
274.
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