ATMEGA644PV-20AU Atmel, ATMEGA644PV-20AU Datasheet - Page 133
![IC MCU AVR 64K FLASH 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PV-20AU
Manufacturer Part Number
ATMEGA644PV-20AU
Description
IC MCU AVR 64K FLASH 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-20AU
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
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8011O–AVR–07/10
Table 13-3 on page 133
the fast PWM mode.
Table 13-3.
Note:
Table 13-4 on page 133
the phase correct or the phase and frequency correct, PWM mode.
Table 13-4.
Note:
• Bit 1:0 – WGMn1:0: Waveform Generation Mode
Combined with the WGMn3:2 bits found in the TCCRnB Register, these bits control the counting
sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-
form generation to be used, see
Timer/Counter unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode,
and three types of Pulse Width Modulation (PWM) modes.
COMnA1/COMnB1
COMnA1/COMnB1
1. A special case occurs when OCRnA/OCRnB equals TOP and COMnA1/COMnB1 is set. In
1. A special case occurs when OCRnA/OCRnB equals TOP and COMnA1/COMnB1 is set.
0
0
1
1
0
0
1
1
this case the compare match is ignored, but the set or clear is done at BOTTOM.
“13.9.3” on page 124.
Section “13.9.4” on page 126.
Compare Output Mode, Fast PWM
Compare Output Mode, Phase Correct and Phase and Frequency Correct
PWM
(1)
shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to
shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to
COMnA0/COMnB0
COMnA0/COMnB0
for more details.
0
1
0
1
0
1
0
1
Table 13-5 on page
for more details.
Description
Normal port operation, OCnA/OCnB disconnected.
WGMn3:0 = 14 or 15: Toggle OC1A on Compare
Match, OC1B disconnected (normal port operation).
For all other WGM1 settings, normal port operation,
OC1A/OC1B disconnected.
Clear OCnA/OCnB on Compare Match, set
OCnA/OCnB at BOTTOM (non-inverting mode)
Set OCnA/OCnB on Compare Match, clear
OCnA/OCnB at BOTTOM (inverting mode)
Description
Normal port operation, OCnA/OCnB disconnected.
WGMn3:0 = 9 or 11: Toggle OCnA on Compare
Match, OCnB disconnected (normal port operation).
For all other WGM1 settings, normal port operation,
OC1A/OC1B disconnected.
Clear OCnA/OCnB on Compare Match when up-
counting. Set OCnA/OCnB on Compare Match when
downcounting.
Set OCnA/OCnB on Compare Match when up-
counting. Clear OCnA/OCnB on Compare Match
when downcounting.
ATmega164P/324P/644P
(1)
134. Modes of operation supported by the
(See Section “13.9” on page
See Section
123.).
See
133
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