ATMEGA644V-10MU Atmel, ATMEGA644V-10MU Datasheet - Page 150

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

Specifications of ATMEGA644V-10MU

• 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: 44-VQFN Exposed Pad
• Package: 44QFN EP
• Device Core: AVR
• Family Name: ATmega
• Maximum Speed: 10 MHz
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 32
• Interface Type: JTAG/SPI/TWI/USART
• On-chip Adc: 8-chx10-bit
• Number Of Timers: 3
• Processor Series: ATMEGA64x
• Core: AVR8
• Data Ram Size: 4 KB
• Maximum Clock Frequency: 20 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• For Use With: ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFPATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15.11.3
15.11.4
15.11.5
15.11.6
150
ATmega644
TCNT2 – Timer/Counter Register
OCR2A – Output Compare Register A
OCR2B – Output Compare Register B
ASSR – Asynchronous Status Register
Table 15-9.
If external pin modes are used for the Timer/Counter0, transitions on the T0 pin will clock the
counter even if the pin is configured as an output. This feature allows software control of the
counting.
The Timer/Counter Register gives direct access, both for read and write operations, to the
Timer/Counter unit 8-bit counter. Writing to the TCNT2 Register blocks (removes) the Compare
Match on the following timer clock. Modifying the counter (TCNT2) while the counter is running,
introduces a risk of missing a Compare Match between TCNT2 and the OCR2x Registers.
The Output Compare Register A contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2A pin.
The Output Compare Register B contains an 8-bit value that is continuously compared with the
counter value (TCNT2). A match can be used to generate an Output Compare interrupt, or to
generate a waveform output on the OC2B pin.
Bit
(0xB2)
Read/Write
Initial Value
Bit
(0xB3)
Read/Write
Initial Value
Bit
(0xB4)
Read/Write
Initial Value
Bit
(0xB6)
Read/Write
Initial Value
CS22
0
1
1
1
1
R
7
–
0
Clock Select Bit Description
R/W
R/W
R/W
7
0
7
0
7
0
CS21
EXCLK
1
0
0
1
1
R/W
6
0
R/W
R/W
R/W
6
0
6
0
6
0
AS2
R/W
5
0
CS20
R/W
R/W
R/W
1
0
1
0
1
TCN2UB
5
0
5
0
5
0
R
4
0
R/W
R/W
R/W
Description
clk
clk
clk
clk
clk
4
0
4
0
4
0
OCR2A[7:0]
OCR2B[7:0]
OCR2AUB
TCNT2[7:0]
T2S
T2S
T2S
T
T
2
2
S
S
R
3
0
/256 (From prescaler)
/1024 (From prescaler)
/32 (From prescaler)
/64 (From prescaler)
/128 (From prescaler)
R/W
R/W
R/W
3
0
3
0
3
0
OCR2BUB
R
2
0
R/W
R/W
R/W
2
0
2
0
2
0
TCR2AUB
R/W
R/W
R/W
R
1
0
1
0
1
0
1
0
TCR2BUB
R/W
R/W
R/W
0
0
0
0
0
0
0
R
0
2593N–AVR–07/10
OCR2A
OCR2B
TCNT2
ASSR