ATMEGA644V-10AUR Atmel, ATMEGA644V-10AUR Datasheet - Page 18
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ATMEGA644V-10AUR
Manufacturer Part Number
ATMEGA644V-10AUR
Description
MCU AVR 64K FLASH 10MHZ 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644V-10AUR
Core Processor
AVR
Core Size
8-Bit
Speed
10MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K 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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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6.2
18
SRAM Data Memory
ATmega644
Figure 6-2 on page 18
The ATmega644 is a complex microcontroller with more peripheral units than can be supported
within the 64 location reserved in the Opcode for the IN and OUT instructions. For the Extended
I/O space from $060 - $0FF in SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can
be used.
The first 4,352 Data Memory locations address both the Register File, the I/O Memory,
Extended I/O Memory, and the internal data SRAM. The first 32 locations address the Register
file, the next 64 location the standard I/O Memory, then 160 locations of Extended I/O memory
and the next 4,096 locations address the internal data SRAM.
The five different addressing modes for the data memory cover: Direct, Indirect with Displace-
ment, Indirect, Indirect with Pre-decrement, and Indirect with Post-increment. In the Register file,
registers R26 to R31 feature the indirect addressing pointer registers.
The direct addressing reaches the entire data space.
The Indirect with Displacement mode reaches 63 address locations from the base address given
by the Y- or Z-register.
When using register indirect addressing modes with automatic pre-decrement and post-incre-
ment, the address registers X, Y, and Z are decremented or incremented.
The 32 general purpose working registers, 64 I/O registers, 160 Extended I/O Registers and the
4096 bytes of internal data SRAM in the ATmega644 are all accessible through all these
addressing modes. The Register File is described in
12.
Figure 6-2.
Data Memory Map
shows how the ATmega644 SRAM Memory is organized.
160 Ext I/O Reg.
64 I/O Registers
Data Memory
Internal SRAM
32 Registers
(4096 x 8)
”General Purpose Register File” on page
$0000 - $001F
$10FF
$0020 - $005F
$0060 - $00FF
$0100
2593N–AVR–07/10
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