ATMEGA644V-10MUR Atmel, ATMEGA644V-10MUR Datasheet - Page 132

• Manufacturer Part Number: ATMEGA644V-10MUR
• Description: MCU AVR 64K FLASH 10MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644V-10MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 10MHz
• 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: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15. 8-bit Timer/Counter2 with PWM and Asynchronous Operation
15.1
15.2
132
Features
Overview
ATmega644
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Timer/Counter2 is a general purpose, single channel, 8-bit Timer/Counter module.
A simplified block diagram of the 8-bit Timer/Counter is shown in Figure 14-12.. For the actual
placement of I/O pins, see
ing I/O bits and I/O pins, are shown in bold. The device-specific I/O Register and bit locations
are listed in the
The Power Reduction Timer/Counter2 bit, PRTIM2, in
page 44
Figure 15-1. 8-bit Timer/Counter Block Diagram
Single Channel Counter
Clear Timer on Compare Match (Auto Reload)
Glitch-free, Phase Correct Pulse Width Modulator (PWM)
Frequency Generator
10-bit Clock Prescaler
Overflow and Compare Match Interrupt Sources (TOV2, OCF2A and OCF2B)
Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock
must be written to zero to enable Timer/Counter2 module.
Status flags
”Register Description” on page
Timer/Counter
TCCRnA
TCNTn
OCRnA
OCRnB
=
=
”Pin Configurations” on page
Direction
Count
Clear
ASSRn
Synchronized Status flags
Control Logic
TOP
=
TCCRnB
asynchronous mode
Value
BOTTOM
Fixed
TOP
select (ASn)
clk
=
Tn
0
146.
Prescaler
Synchronization Unit
OCnA
(Int.Req.)
OCnB
(Int.Req.)
2. CPU accessible I/O Registers, includ-
Generation
Generation
Waveform
Waveform
”PRR – Power Reduction Register” on
TOVn
(Int.Req.)
OCnA
OCnB
Oscillator
T/C
clk
I/O
clk
clk
I/O
ASY
2593N–AVR–07/10
TOSC1
TOSC2