ATMEGA165-16AI Atmel, ATMEGA165-16AI Datasheet - Page 84

• Manufacturer Part Number: ATMEGA165-16AI
• Description: IC AVR MCU 16K 16MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA165-16AI

• 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: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Timer/Counter Timing
Diagrams
2573G–AVR–07/09
•
The Timer/Counter is a synchronous design and the timer clock (clk
shown as a clock enable signal in the following figures. The figures include information
on when Interrupt Flags are set. Figure 34 contains timing data for basic Timer/Counter
operation. The figure shows the count sequence close to the MAX value in all modes
other than phase correct PWM mode.
Figure 34. Timer/Counter Timing Diagram, no Prescaling
Figure 35 shows the same timing data, but with the prescaler enabled.
Figure 35. Timer/Counter Timing Diagram, with Prescaler (f
Figure 36 shows the setting of OCF0A in all modes except CTC mode.
Figure 36. Timer/Counter Timing Diagram, Setting of OCF0A, with Prescaler (f
TCNTn
TCNTn
TCNTn
(clk
(clk
(clk
OCRnx
TOVn
TOVn
OCFnx
clk
clk
clk
clk
clk
clk
I/O
I/O
I/O
The timer starts counting from a value higher than the one in OCR0A, and for that
reason misses the Compare Match and hence the OCn change that would have
happened on the way up.
I/O
Tn
I/O
Tn
I/O
Tn
/1)
/8)
/8)
OCRnx - 1
MAX - 1
MAX - 1
OCRnx
MAX
MAX
OCRnx Value
OCRnx + 1
BOTTOM
BOTTOM
clk_I/O
ATmega165/V
/8)
T0
) is therefore
BOTTOM + 1
BOTTOM + 1
OCRnx + 2
clk_I/O
/8)
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