ATMEGA644A-MU Atmel, ATMEGA644A-MU Datasheet - Page 132
![IC MCU AVR 64K FLASH 44VQFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
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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8272A–AVR–01/10
Figure 15-11. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (f
Figure 15-12
frequency correct PWM mode the OCRnx Register is updated at BOTTOM. The timing diagrams
will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on.
The same renaming applies for modes that set the TOVn Flag at BOTTOM.
Figure 15-12. Timer/Counter Timing Diagram, no Prescaling
Figure 15-13
164A/164PA/324A/324PA/644A/644PA/1284/1284P
(PC and PFC PWM)
and ICFn
(CTC and FPWM)
OCRnx
TCNTn
OCFnx
TOVn
(Update at TOP)
(clk
clk
clk
OCRnx
I/O
TCNTn
TCNTn
as TOP)
(clk
I/O
Tn
clk
clk
/8)
I/O
(FPWM)
shows the count sequence close to TOP in various modes. When using phase and
shows the same timing data, but with the prescaler enabled.
I/O
Tn
/1)
(if used
OCRnx - 1
TOP - 1
TOP - 1
Old OCRnx Value
OCRnx
OCRnx Value
TOP
TOP
OCRnx + 1
BOTTOM
TOP - 1
New OCRnx Value
OCRnx + 2
BOTTOM + 1
TOP - 2
clk_I/O
/8)
132
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