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Atmel ATmega32M1 User Manual

Atmel ATmega32M1
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Page #102 background image
102
7647H–AVR–03/12
Atmel ATmega16/32/64/M1/C1
Table 12-4 shows the COM0A1:0 bit functionality when the WGM02:0 bits are set to phase cor-
rect PWM mode.
Note: 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 TOP. See “Phase Correct PWM Mode” on
page 123 for more details.
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. Table 12-5 shows the COM0B1:0 bit functionality when the WGM02:0 bits
are set to a normal or CTC mode (non-PWM).
Table 12-6 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to fast PWM
mode.
Note: 1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at TOP. See “Fast PWM Mode” on page 96
for more details.
Table 12-4. Compare Output Mode, Phase Correct PWM Mode
(1)
COM0A1 COM0A0 Description
0 0 Normal port operation, OC0A disconnected.
01
WGM02 = 0: Normal Port Operation, OC0A Disconnected.
WGM02 = 1: Toggle OC0A on Compare Match.
10
Clear OC0A on Compare Match when up-counting. Set OC0A on
Compare Match when down-counting.
11
Set OC0A on Compare Match when up-counting. Clear OC0A on
Compare Match when down-counting.
Table 12-5. Compare Output Mode, non-PWM Mode
COM0B1 COM0B0 Description
0 0 Normal port operation, OC0B disconnected.
0 1 Toggle OC0B on Compare Match
1 0 Clear OC0B on Compare Match
1 1 Set OC0B on Compare Match
Table 12-6. Compare Output Mode, Fast PWM Mode
(1)
COM0B1 COM0B0 Description
0 0 Normal port operation, OC0B disconnected.
01Reserved
1 0 Clear OC0B on Compare Match, set OC0B at TOP
1 1 Set OC0B on Compare Match, clear OC0B at TOP

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Atmel ATmega32M1 Specifications

General IconGeneral
Architecture8-bit AVR
Flash Memory32 KB
SRAM2 KB
EEPROM1 KB
Clock Speed16 MHz
GPIO Pins32
I/O Pins32
ADC Channels8
ADC Resolution10-bit
UART1
USART1
SPI1
I2C1
PWM Channels6
CAN1
Operating Voltage2.7V - 5.5V
Operating Temperature-40°C to +85°C
Temperature Range-40°C to +85°C
Package44-TQFP, 44-QFN

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