ATMEGA644PA-AU Atmel, ATMEGA644PA-AU Datasheet - Page 107
ATMEGA644PA-AU
Manufacturer Part Number
ATMEGA644PA-AU
Description
IC MCU 8BIT 64KB FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PA-AU
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
Processor Series
ATMEGA64x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
SPI, TWI, UART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
32
Operating Supply Voltage
1.8 V to 5.5 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
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Manufacturer:
PHILIPS
Quantity:
450
Part Number:
ATMEGA644PA-AU
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
Company:
Part Number:
ATMEGA644PA-AUR
Manufacturer:
ATMEL
Quantity:
1 400
Part Number:
ATMEGA644PA-AUR
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
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8272A–AVR–01/10
Table 14-7 on page 107
to phase correct PWM mode.
Table 14-7.
Note:
• Bits 3:2 – Res: Reserved Bits
These bits are reserved bits in the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
and will always read as zero.
• Bits 1:0 – WGM01:0: Waveform Generation Mode
Combined with the WGM02 bit found in the TCCR0B 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 two types of Pulse Width Modulation (PWM) modes (see
124).
Table 14-8.
Notes:
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Mode
COM0B1
0
1
2
3
4
5
6
7
0
0
1
1
1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Com-
2. BOTTOM = 0x00
1. MAX
WGM2
pare Match is ignored, but the set or clear is done at TOP. See
page 102
0
0
0
0
1
1
1
1
Compare Output Mode, Phase Correct PWM Mode
Waveform Generation Mode Bit Description
COM0B0
= 0xFF
for more details.
WGM1
0
1
0
1
0
0
1
1
0
0
1
1
shows the COM0B1:0 bit functionality when the WGM02:0 bits are set
Description
Normal port operation, OC0B disconnected.
Reserved
Clear OC0B on Compare Match when up-counting. Set OC0B on
Compare Match when down-counting.
Set OC0B on Compare Match when up-counting. Clear OC0B on
Compare Match when down-counting.
WGM0
Table 14-8 on page
0
1
0
1
0
1
0
1
Timer/Counter
Mode of
Operation
Normal
PWM, Phase
Correct
CTC
Fast PWM
Reserved
PWM, Phase
Correct
Reserved
Fast PWM
107. Modes of operation supported by the
OCRA
OCRA
OCRA
0xFF
0xFF
0xFF
TOP
–
–
”Modes of Operation” on page
(1)
”Phase Correct PWM Mode” on
Update of
Immediate
Immediate
BOTTOM
BOTTOM
OCRx at
TOP
TOP
–
–
Set on
TOV Flag
BOTTOM
BOTTOM
MAX
MAX
MAX
TOP
–
–
(1)(2)
107
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