ATMEGA2561V-8AU Atmel, ATMEGA2561V-8AU Datasheet - Page 32
![IC AVR MCU 256K 8MHZ 64TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA2561V-8AU
Manufacturer Part Number
ATMEGA2561V-8AU
Description
IC AVR MCU 256K 8MHZ 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA2561V-8AU
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Processor Series
ATMEGA256x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
8 KB
Interface Type
2-Wire/SPI/USART
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
54
Number Of Timers
6
Operating Supply Voltage
1.8 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
For Use With
ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFP770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1005 - ISP 4PORT FOR ATMEL AVR MCU JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEM
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA2561V-8AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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8.1.5
2549M–AVR–09/10
Using all Locations of External Memory Smaller than 64 Kbytes
Figure 8-5.
Note:
Figure 8-6.
Note:
Since the external memory is mapped after the internal memory as shown in
28, the external memory is not addressed when addressing the first 8,704 bytes of data space. It
may appear that the first 8,704 bytes of the external memory are inaccessible (external memory
addresses 0x0000 to 0x21FF). However, when connecting an external memory smaller than 64
Kbytes, for example 32 Kbytes, these locations are easily accessed simply by addressing from
address 0x8000 to 0xA1FF. Since the External Memory Address bit A15 is not connected to the
external memory, addresses 0x8000 to 0xA1FF will appear as addresses 0x0000 to 0x21FF for
the external memory. Addressing above address 0xA1FF is not recommended, since this will
address an external memory location that is already accessed by another (lower) address. To
System Clock (CLK
System Clock (CLK
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
DA7:0 (XMBK = 0)
DA7:0 (XMBK = 1)
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
1. SRWn1 = SRW11 (upper sector) or SRW01 (lower sector), SRWn0 = SRW10 (upper sector) or
SRW00 (lower sector).
The ALE pulse in period T6 is only present if the next instruction accesses the RAM (internal
or external).
SRW00 (lower sector).
The ALE pulse in period T7 is only present if the next instruction accesses the RAM (internal
or external).
DA7:0
A15:8
CPU
ALE
DA7:0
WR
A15:8
RD
External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 0
External Data Memory Cycles with SRWn1 = 1 and SRWn0 = 1
CPU
ALE
WR
)
RD
)
Prev. addr.
Prev. data
Prev. data
Prev. data
Prev. addr.
Prev. data
Prev. data
Prev. data
T1
T1
Address
Address
Address
ATmega640/1280/1281/2560/2561
T2
Address
Address
Address
XX
T2
XX
Address
T3
Data
Data
Data
Address
T3
Data
Data
Data
T4
T4
T5
T5
T6
Figure 8-1 on page
(1)
(1)
T6
T7
32
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