ATMEGA8-16AC Atmel, ATMEGA8-16AC Datasheet - Page 94

• Manufacturer Part Number: ATMEGA8-16AC
• Description: IC AVR MCU 8K 16MHZ COM 32-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8-16AC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: ATMEGA816AC

Timer/Counter
Timing Diagrams
94
ATmega8(L)
output will be continuously low and if set equal to TOP the output will be set to high for non-
inverted PWM mode. For inverted PWM the output will have the opposite logic values.
If OCR1A is used to define the TOP value (WGM13:0 = 9) and COM1A1:0 = 1, the OC1A output
will toggle with a 50% duty cycle.
The Timer/Counter is a synchronous design and the timer clock (clk
clock enable signal in the following figures. The figures include information on when Interrupt
Flags are set, and when the OCR1x Register is updated with the OCR1x buffer value (only for
modes utilizing double buffering).
Figure 41. Timer/Counter Timing Diagram, Setting of OCF1x, no Prescaling
Figure 42
Figure 42. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f
Figure 43 on page 95
phase and frequency correct PWM mode the OCR1x Register is updated at BOTTOM. The tim-
TCNTn
OCRnx
OCRnx
OCFnx
TCNTn
OCFnx
(clk
(clk
clk
clk
clk
clk
I/O
I/O
I/O
Tn
I/O
Tn
/1)
/8)
shows the same timing data, but with the prescaler enabled.
OCRnx - 1
shows the count sequence close to TOP in various modes. When using
OCRnx - 1
Figure 41
OCRnx
shows a timing diagram for the setting of OCF1x.
OCRnx
OCRnx Value
OCRnx Value
OCRnx + 1
OCRnx + 1
T1
) is therefore shown as a
clk_I/O
OCRnx + 2
OCRnx + 2
2486Z–AVR–02/11
/8)