ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 105

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

9223B–AVR–09/11
Table 15-4
correct PWM mode.
Table 15-4.
• 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 con-
nected 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.
WGM02:0 bits are set to a normal or CTC mode (non-PWM).
Table 15-5.
Table 15-6
mode.
Table 15-6.
Note:
Note:
COM0A1
COM0B1
COM0B1
Atmel ATmega48PA/88PA/168PA [Preliminary]
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
1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the
shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to fast PWM
shows the COM0A1:0 bit functionality when the WGM02:0 bits are set to phase
Compare Match is ignored, but the set or clear is done at TOP. See
Mode” on page 127
Compare Match is ignored, but the set or clear is done at TOP. See
page 99
Compare Output Mode, Phase Correct PWM Mode
Compare Output Mode, non-PWM Mode
Compare Output Mode, Fast PWM Mode
COM0A0
COM0B0
COM0B0
for more details.
0
1
0
1
0
1
0
1
0
1
0
1
Table 15-5 on page 105
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
Description
Normal port operation, OC0B disconnected.
Reserved
Clear OC0B on Compare Match, set OC0B at BOTTOM,
(non-inverting mode)
Set OC0B on Compare Match, clear OC0B at BOTTOM,
(inverting mode).
for more details.
shows the COM0B1:0 bit functionality when the
(1)
(1)
“Phase Correct PWM
“Fast PWM Mode” on
105