ATMEGA2561-16AI Atmel, ATMEGA2561-16AI Datasheet - Page 33
ATMEGA2561-16AI
Manufacturer Part Number
ATMEGA2561-16AI
Description
IC AVR MCU 256K 16MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA2561-16AI
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
256KB (128K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
8K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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8.1.6
2549M–AVR–09/10
Using all 64 Kbytes Locations of External Memory
the Application software, the external 32 Kbytes memory will appear as one linear 32 Kbytes
address space from 0x2200 to 0xA1FF. This is illustrated in
Figure 8-7.
Since the External Memory is mapped after the Internal Memory as shown in
28, only 56 Kbytes of External Memory is available by default (address space 0x0000 to 0x21FF
is reserved for internal memory). However, it is possible to take advantage of the entire External
Memory by masking the higher address bits to zero. This can be done by using the XMMn bits
and control by software the most significant bits of the address. By setting Port C to output 0x00,
and releasing the most significant bits for normal Port Pin operation, the Memory Interface will
address 0x0000 - 0x2FFF. See the following code examples.
Care must be exercised using this option as most of the memory is masked away.
Address Map with 32 Kbytes External Memory
0x0000
0x21FF
0x2200
0x7FFF
0x8000
0x90FF
0x9100
AVR Memory Map
Internal Memory
ATmega640/1280/1281/2560/2561
External
Memory
External 32K SRAM
Figure
8-7.
0x7FFF
0x0000
Figure 8-1 on page
33
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