ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 150

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

150
ATmega164P/324P/644P
Figure 15-9 on page 150
Figure 15-9. Timer/Counter Timing Diagram, with Prescaler (f
Figure 15-10 on page 150
Figure 15-10. Timer/Counter Timing Diagram, Setting of OCF2A, with Prescaler (f
Figure 15-11 on page 151
TCNTn
(clk
TOVn
TCNTn
clk
clk
(clk
OCRnx
OCFnx
clk
clk
I/O
I/O
Tn
I/O
/8)
I/O
Tn
/8)
MAX - 1
OCRnx - 1
shows the same timing data, but with the prescaler enabled.
shows the setting of OCF2A and the clearing of TCNT2 in CTC mode.
shows the setting of OCF2A in all modes except CTC mode.
OCRnx
MAX
OCRnx Value
OCRnx + 1
BOTTOM
clk_I/O
/8)
BOTTOM + 1
OCRnx + 2
clk_I/O
7674F–AVR–09/09
/8)