ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 129

• Manufacturer Part Number: ATMEGA645A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• 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: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8285B–AVR–03/11
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
Figure 15-12. Timer/Counter Timing Diagram, no Prescaling
Figure 15-13
Figure 15-13. Timer/Counter Timing Diagram, with Prescaler (f
and ICF n
(PC and PFC PWM)
and ICFn
(CTC and FPWM)
TOVn
(Update at TOP)
(PC and PFC PWM)
TOVn
(CTC and FPWM)
(Update at TOP)
TCNTn
TCNTn
OCRnx
as TOP)
(clk
OCRnx
TCNTn
TCNTn
as TOP)
(clk
clk
clk
clk
clk
I/O
I/O
(FPWM)
shows the same timing data, but with the prescaler enabled.
(FPWM)
I/O
Tn
I/O
Tn
/8)
(if used
/1)
(if used
TOP - 1
TOP - 1
TOP - 1
TOP - 1
Old OCRnx Value
Old OCRnx Value
TOP
TOP
TOP
TOP
BOTTOM
BOTTOM
TOP - 1
TOP - 1
clk_I/O
New OCRnx Value
New OCRnx Value
/8)
BOTTOM + 1
BOTTOM + 1
TOP - 2
TOP - 2
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