ATmega16U4 datasheet(164/408 Pages) ATMEL

164 / 408 page

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7766D–AVR–01/09

ATmega16U4/ATmega32U4

Table 15-8 shows the COM4A1:0 bit functionality when the PWM4A, WGM40 and WGM41 bits

are set to Phase and Frequency Correct PWM Mode.

Table 15-9 shows the COM4A1:0 bit functionality when the PWM4A, WGM40 and WGM41 bits

are set to single-slope PWM6 Mode. In the PWM6 Mode the same Waveform Output (OCW4A)

is used for generating all waveforms and the Output Compare values OC4A and OC4A are con-

nected on OC4x and OC4x pins as described below.

Table 15-10 shows the COM4A1:0 bit functionality when the PWM4A, WGM40 and WGM41 bits

are set to dual-slope PWM6 Mode.I

• Bits 5,4 - COM4B1, COM4B0: Comparator B Output Mode, Bits 1 and 0

These bits control the behavior of the Waveform Output (OCW4B) and the connection of the

Output Compare pin (OC4B). If one or both of the COM4B1:0 bits are set, the OC4B output

overrides the normal port functionality of the I/O pin it is connected to. The complementary

OC4B output is connected only in PWM modes when the COM4B1:0 bits are set to “01”. Note

Table 15-8.

Compare Output Mode, Phase and Frequency Correct PWM Mode

COM1A1..0

OCW1A Behavior

OC4A Pin

Normal port operation.

Disconnected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

Connected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

Connected

Disconnected

Set on Compare Match when up-counting.

Cleared on Compare Match when down-counting.

Connected

Disconnected

Table 15-9.

Compare Output Mode, Single-Slope PWM6 Mode

COM4A1..0

OCW4A Behavior

OC4x Pin

Normal port operation.

Disconnected

Cleared on Compare Match.

Set when TCNT4 = 0x000.

OC4A

Cleared on Compare Match.

Set when TCNT4 = 0x000.

OC4A

Set on Compare Match.

Cleared when TCNT4 = 0x000.

OC4A

Table 15-10. Compare Output Mode, Dual-Slope PWM6 Mode

COM4A1..0

OCW4A Behavior

OC4x Pin

Normal port operation.

Disconnected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

OC4A

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

OC4A

Set on Compare Match when up-counting.

Cleared on Compare Match when down-counting.

OC4A

ATmega16U4 Datasheet(PDF) 164 Page - ATMEL Corporation

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