ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 164

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 14
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 26
• Ext Interrupts: 13
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 3.3
• 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: 4
• Output Compare Channels: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

7766F–AVR–11/10
that the Data Direction Register (DDR) bit corresponding to the OC4B pin must be set in order to
enable the output driver.
The function of the COM4B1:0 bits depends on the PWM4B and WGM40 bit settings.
11
PWM).
Table 15-11. Compare Output Mode, Normal Mode (non-PWM)
Table 15-12
Fast PWM Mode.
Table 15-12. Compare Output Mode, Fast PWM Mode
Table 15-13
Phase and Frequency Correct PWM Mode.
Table 15-13. Compare Output Mode, Phase and Frequency Correct PWM Mode
• Bit 3 - FOC4A: Force Output Compare Match 4A
The FOC4A bit is only active when the PWM4A bit specify a non-PWM mode.
Writing a logical one to this bit forces a change in the Waveform Output (OCW4A) and the Out-
put Compare pin (OC4A) according to the values already set in COM4A1 and COM4A0. If
COM4A1 and COM4A0 written in the same cycle as FOC4A, the new settings will be used. The
Force Output Compare bit can be used to change the output pin value regardless of the timer
COM4B1..0
COM4B1..0
COM4B1..0
shows the COM4B1:0 bit functionality when the PWM4B bit is set to Normal Mode (non-
00
01
10
11
00
01
10
11
00
01
10
11
shows the COM4B1:0 bit functionality when the PWM4B and WGM40 bits are set to
shows the COM4B1:0 bit functionality when the PWM4B and WGM40 bits are set to
OCW4B Behavior
Normal port operation.
Toggle on Compare Match.
Clear on Compare Match.
Set on Compare Match.
OCW4B Behavior
Normal port operation.
Cleared on Compare Match.
Set when TCNT4 = 0x000.
Cleared on Compare Match.
Set when TCNT4 = 0x000.
Set on Compare Match.
Cleared when TCNT4 = 0x000.
OCW4B Behavior
Normal port operation.
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
Cleared on Compare Match when up-counting.
Set on Compare Match when down-counting.
Set on Compare Match when up-counting.
Cleared on Compare Match when down-counting.
ATmega16/32U4
Disconnected
Disconnected
Disconnected
Connected
Connected
Connected
Connected
Connected
Connected
Connected
Connected
Connected
OC4B Pin
OC4B Pin
OC4B Pin
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Disconnected
Connected
Connected
OC4B Pin
OC4B Pin
OC4B Pin
Table 15-
164