ATMEGA644A-MU Atmel, ATMEGA644A-MU Datasheet - Page 21
ATMEGA644A-MU
Manufacturer Part Number
ATMEGA644A-MU
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
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
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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7.3.1
8272A–AVR–01/10
Data Memory Access Times
The 32 general purpose working registers, 64 I/O registers, 160 Extended I/O Registers and
t h e 1 0 2 4 / 2 0 4 8 / 4 0 9 6 b y t e s o f i n t e r n a l d a t a S R A M i n t h e
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P are all accessible through all these
addressing modes. The Register File is described in
13.
Figure 7-2.
This section describes the general access timing concepts for internal memory access. The
internal data SRAM access is performed in two clk
Figure 7-3.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Address
clk
Data Memory Map for
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
On-chip Data SRAM Access Cycles
Data
Data
WR
CPU
(1024/2048/4096/16384x 8)
RD
160 Ext I/O Reg.
64 I/O Registers
Data Memory
Internal SRAM
32 Registers
Compute Address
T1
Memory Access Instruction
0x0000 - 0x001F
0x0100
0x04FF/0x08FF/0x10FF /0x40FF
0x0020 - 0x005F
0x0060 - 0x00FF
Address valid
CPU
T2
”General Purpose Register File” on page
cycles as described in
Next Instruction
T3
Figure
7-3.
21
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