114
2588B–AVR–11/06
ATtiny261/461/861
Table 16-8 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits
are set to Phase and Frequency Correct PWM Mode.
Table 16-9 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits
are set to single-slope PWM6 Mode. In the PWM6 Mode the same Waveform Output (OCW1A)
is used for generating all waveforms and the Output Compare values OC1A and OC1A
are con-
nected on thw all OC1x and OC1x
pins as described below.
Table 16-10 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits
are set to dual-slope PWM6 Mode.I
• Bits 5,4 - COM1B1, COM1B0: Comparator B Output Mode, Bits 1 and 0
These bits control the behaviour of the Waveform Output (OCW1B) and the connection of the
Output Compare pin (OC1B). If one or both of the COM1B1:0 bits are set, the OC1B output
overrides the normal port functionality of the I/O pin it is connected to. The complementary
OC1B
output is connected only in PWM modes when the COM1B1:0 bits are set to “01”. Note
Table 16-8. Compare Output Mode, Phase and Frequency Correct PWM Mode
COM1A1..0 OCW1A Behaviour OC1A Pin OC1A 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 16-9. Compare Output Mode, Single-Slope PWM6 Mode
COM1A1..0 OCW1A Behaviour OC1x Pin OC1x Pin
00 Normal port operation. Disconnected Disconnected
01
Cleared on Compare Match.
Set when TCNT1 = 0x000.
OC1A OC1A
10
Cleared on Compare Match.
Set when TCNT1 = 0x000.
OC1A OC1A
11
Set on Compare Match.
Cleared when TCNT1 = 0x000.
OC1A OC1A
Table 16-10. Compare Output Mode, Dual-Slope PWM6 Mode
COM1A1..0 OCW1A Behaviour OC1x Pin OC1x Pin
00 Normal port operation. Disconnected Disconnected
01
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
OC1A OC1A
10
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
OC1A OC1A
11
Set on Compare Match when up-counting.
Cleared on Compare Match when down-counting.
OC1A OC1A
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