ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 85

• Manufacturer Part Number: ATmega32A
• Manufacturer: Atmel Corporation

Specifications of ATmega32A

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

8155C–AVR–02/11
Table 14-2.
Note:
• Bit 5:4 – COM0[1:0]: Compare Match Output Mode
These bits control the Output Compare pin (OC0) behavior. If one or both of the COM01:0 bits
are set, the OC0 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 OC0 pin must be
set in order to enable the output driver.
When OC0 is connected to the pin, the function of the COM01:0 bits depends on the WGM01:0
bit setting.
normal or CTC mode (non-PWM).
Table 14-3.
Table 14-4
mode.
Table 14-4.
Note:
Table 14-5
rect PWM mode.
Mode
COM01
0
1
2
3
COM01
0
0
1
1
0
0
1
1
1. The CTC0 and PWM0 bit definition names are now obsolete. Use the WGM01:0 definitions.
1. A special case occurs when OCR0 equals TOP and COM01 is set. In this case, the compare
Table 14-3
WGM01
However, the functionality and location of these bits are compatible with previous versions of
the timer.
match is ignored, but the set or clear is done at BOTTOM. See
for more details.
shows the COM0[1:0] bit functionality when the WGM01:0 bits are set to phase cor-
(CTC0)
shows the COM01:0 bit functionality when the WGM01:0 bits are set to fast PWM
0
0
1
1
Waveform Generation Mode Bit Description
Compare Output Mode, non-PWM Mode
Compare Output Mode, Fast PWM Mode
COM00
COM00
0
1
0
1
0
1
0
1
shows the COM01:0 bit functionality when the WGM01:0 bits are set to a
WGM00
(PWM0)
0
1
0
1
Description
Normal port operation, OC0 disconnected.
Reserved
Clear OC0 on compare match, set OC0 at BOTTOM,
(nin-inverting mode)
Set OC0 on compare match, clear OC0 at BOTTOM,
(inverting mode)
Description
Normal port operation, OC0 disconnected.
Toggle OC0 on compare match
Clear OC0 on compare match
Set OC0 on compare match
Timer/Counter Mode of
Operation
Normal
PWM, Phase Correct
CTC
Fast PWM
(1)
(1)
TOP
0xFF
0xFF
OCR0
0xFF
“Fast PWM Mode” on page 79
Update of
OCR0
Immediate
TOP
Immediate
BOTTOM
ATmega32A
TOV0 Flag
Set-on
MAX
BOTTOM
MAX
MAX
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