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ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
The table 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 connected on OC4x and OC4x pins as
described below.
The table shows the COM4A1:0 bit functionality when the PWM4A, WGM40, and WGM41 bits are set to dual-
slope PWM6 Mode.
• 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
Table 15-7. Compare Output Mode, Phase and Frequency Correct PWM Mode
COM1A1..0 OCW1A Behavior OC4A Pin OC4A Pin
00 Normal port operation. Disconnected Disconnected
01
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
Connected Connected
10
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
Connected Disconnected
11
Set on Compare Match when up-counting.
Cleared on Compare Match when down-counting.
Connected Disconnected
Table 15-8. Compare Output Mode, Single-Slope PWM6 Mode
COM4A1..0 OCW4A Behavior OC4x Pin OC4x Pin
00 Normal port operation Disconnected Disconnected
01
Cleared on Compare Match.
Set when TCNT4 = 0x000.
OC4A OC4A
10
Cleared on Compare Match.
Set when TCNT4 = 0x000.
OC4A OC4A
11
Set on Compare Match.
Cleared when TCNT4 = 0x000.
OC4A OC4A
Table 15-9. Compare Output Mode, Dual-Slope PWM6 Mode
COM4A1..0 OCW4A Behavior OC4x Pin OC4x Pin
00 Normal port operation Disconnected Disconnected
01
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
OC4A OC4A
10
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
OC4A OC4A
11
Set on Compare Match when up-counting.
Cleared on Compare Match when down-counting.
OC4A OC4A