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ATMEGA8515-16AU Datasheet(PDF) 91 Page - ATMEL Corporation |
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ATMEGA8515-16AU Datasheet(HTML) 91 Page - ATMEL Corporation |
91 / 254 page ![]() 91 ATmega8515(L) 2512G–AVR–03/05 When OC0 is connected to the pin, the function of the COM01:0 bits depends on the WGM01:0 bit setting. Table 45 shows the COM01:0 bit functionality when the WGM01:0 bits are set to a normal or CTC mode (non-PWM). Table 46 shows the COM01:0 bit functionality when the WGM01:0 bits are set to fast PWM mode. Note: 1. A special case occurs when OCR0 equals TOP and COM01 is set. In this case, the Compare Match is ignored, but the set or clear is done at TOP. See “Fast PWM Mode” on page 85 for more details. Table 47 shows the COM01:0 bit functionality when the WGM01:0 bits are set to phase correct PWM mode. Note: 1. A special case occurs when OCR0 equals TOP and COM01 is set. In this case, the Compare Match is ignored, but the set or clear is done at TOP. See “Phase Correct PWM Mode” on page 87 for more details. • Bit 2:0 – CS02:0: Clock Select The three Clock Select bits select the clock source to be used by the Timer/Counter. Table 45. Compare Output Mode, non-PWM Mode COM01 COM00 Description 0 0 Normal port operation, OC0 disconnected. 0 1 Toggle OC0 on Compare Match. 1 0 Clear OC0 on Compare Match. 1 1 Set OC0 on Compare Match. Table 46. Compare Output Mode, Fast PWM Mode(1) COM01 COM00 Description 0 0 Normal port operation, OC0 disconnected. 01 Reserved 1 0 Clear OC0 on Compare Match, set OC0 at TOP. 1 1 Set OC0 on Compare Match, clear OC0 at TOP. Table 47. Compare Output Mode, Phase Correct PWM Mode (1) COM01 COM00 Description 0 0 Normal port operation, OC0 disconnected. 01 Reserved 1 0 Clear OC0 on Compare Match when up-counting. Set OC0 on Compare Match when downcounting. 1 1 Set OC0 on Compare Match when up-counting. Clear OC0 on Compare Match when downcounting. Table 48. Clock Select Bit Description CS02 CS01 CS00 Description 0 0 0 No clock source (Timer/counter stopped). 001 clk I/O/(No prescaling) 010 clk I/O/8 (From prescaler) |
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