AT90PWM3-16SQ datasheet(97/365 Pages) ATMEL

97 / 365 page

AT90PWM2/3

4317B–AVR–02/05

Figure 41 shows the setting of OCF0A and the clearing of TCNT0 in CTC mode and fast

PWM mode where OCR0A is TOP.

Figure 41. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with

Prescaler (f

clk_I/O/8)

8-bit Timer/Counter

Timer/Counter Control

• Bits 7:6 – COM0A1:0: Compare Match Output A Mode

These bits control the Output Compare pin (OC0A) behavior. If one or both of the

COM0A1:0 bits are set, the OC0A output overrides the normal port functionality of the

I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit cor-

responding to the OC0A pin must be set in order to enable the output driver.

When OC0A is connected to the pin, the function of the COM0A1:0 bits depends on the

WGM02:0 bit setting. Table 38 shows the COM0A1:0 bit functionality when the

WGM02:0 bits are set to a normal or CTC mode (non-PWM).

OCFnx

OCRnx

TCNTn

(CTC)

TOP

TOP - 1

TOP

BOTTOM

BOTTOM + 1

clk

I/O

clk

(clk

I/O/8)

Bit

210

COM0A1

COM0A0

COM0B1

COM0B0

–

WGM01

WGM00

TCCR0A

Read/Write

R/W

Initial Value

Table 38. Compare Output Mode, non-PWM Mode

COM0A1

COM0A0

Description

Normal port operation, OC0A disconnected.

Toggle OC0A on Compare Match

Clear OC0A on Compare Match

Set OC0A on Compare Match

AT90PWM3-16SQ Datasheet(PDF) 97 Page - ATMEL Corporation

AT90PWM3-16SQ Datasheet(HTML) 97 Page - ATMEL Corporation

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