ATA5771 ATMEL Corporation, ATA5771 Datasheet - Page 132

• Manufacturer Part Number: ATA5771
• Manufacturer: ATMEL Corporation

80
ATtiny24/44/84
Table 11-3.
Note:
Table 11-4
rect PWM mode.
Table 11-4.
Note:
• Bits 5:4 – COM0B1:0: Compare Match Output B Mode
These bits control the Output Compare pin (OC0B) behavior. If one or both of the COM0B1:0
bits are set, the OC0B output overrides the normal port functionality of the I/O pin it is connected
to. However, note that the Data Direction Register (DDR) bit corresponding to the OC0B pin
must be set in order to enable the output driver.
When OC0B is connected to the pin, the function of the COM0B1:0 bits depends on the
WGM02:0 bit setting.
are set to a normal or CTC mode (non-PWM).
Table 11-5.
COM0A1
COM0A1
COM0B1
0
0
1
1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case, the Com-
1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at BOTTOM. See
page 74
pare Match is ignored, but the set or clear is done at TOP. See
page 76
shows the COM0A1:0 bit functionality when the WGM02:0 bits are set to phase cor-
Compare Output Mode, Fast PWM Mode
Compare Output Mode, Phase Correct PWM Mode
Compare Output Mode, non-PWM Mode
COM0A0
COM0A0
COM0B0
for more details.
for more details.
0
1
0
1
0
1
0
1
0
1
0
1
Table 11-5
Description
Normal port operation, OC0A disconnected
WGM02 = 0: Normal Port Operation, OC0A Disconnected
WGM02 = 1: Toggle OC0A on Compare Match
Clear OC0A on Compare Match
Set OC0A at BOTTOM (non-inverting mode)
Set OC0A on Compare Match
Clear OC0A at BOTTOM (inverting mode)
Description
Normal port operation, OC0A disconnected.
WGM02 = 0: Normal Port Operation, OC0A Disconnected.
WGM02 = 1: Toggle OC0A on Compare Match.
Clear OC0A on Compare Match when up-counting. Set OC0A on
Compare Match when down-counting.
Set OC0A on Compare Match when up-counting. Clear OC0A on
Compare Match when down-counting.
Description
Normal port operation, OC0B disconnected.
Toggle OC0B on Compare Match
Clear OC0B on Compare Match
Set OC0B on Compare Match
shows the COM0B1:0 bit functionality when the WGM02:0 bits
(1)
(1)
“Phase Correct PWM Mode” on
“Fast PWM Mode” on
8006G–AVR–01/08