ATMEGA644A-AUR Atmel, ATMEGA644A-AUR Datasheet - Page 150
ATMEGA644A-AUR
Manufacturer Part Number
ATMEGA644A-AUR
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-AUR
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-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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8272A–AVR–01/10
Figure 16-8. Timer/Counter Timing Diagram, no Prescaling
Figure 16-9 on page 150
Figure 16-9. Timer/Counter Timing Diagram, with Prescaler (f
Figure 16-10 on page 150
Figure 16-10. Timer/Counter Timing Diagram, Setting of OCF2A, with Prescaler (f
164A/164PA/324A/324PA/644A/644PA/1284/1284P
TCNTn
TCNTn
(clk
(clk
TOVn
TOVn
TCNTn
clk
clk
(clk
clk
clk
OCRnx
OCFnx
clk
clk
I/O
I/O
I/O
I/O
Tn
Tn
I/O
/1)
/8)
I/O
Tn
/8)
MAX - 1
OCRnx - 1
MAX - 1
shows the same timing data, but with the prescaler enabled.
shows the setting of OCF2A in all modes except CTC mode.
OCRnx
MAX
MAX
OCRnx Value
OCRnx + 1
BOTTOM
BOTTOM
clk_I/O
/8)
BOTTOM + 1
BOTTOM + 1
OCRnx + 2
clk_I/O
/8)
150
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