ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 72

• 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

10.3.1
10.3.2
7766F–AVR–11/10
MCU Control Register – MCUCR
Alternate Functions of Port B
• Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See
figuring the Pin” on page 66
The Port B pins with alternate functions are shown in
Table 10-3.
The alternate pin configuration is as follows:
• OC0A/OC1C/PCINT7/RTS, Bit 7
OC0A, Output Compare Match A output: The PB7 pin can serve as an external output for the
Timer/Counter0 Output Compare. The pin has to be configured as an output (DDB7 set “one”) to
serve this function. The OC0A pin is also the output pin for the PWM mode timer function.
OC1C, Output Compare Match C output: The PB7 pin can serve as an external output for the
Timer/Counter1 Output Compare C. The pin has to be configured as an output (DDB7 set “one”)
to serve this function. The OC1C pin is also the output pin for the PWM mode timer function.
PCINT7, Pin Change Interrupt source 7: The PB7 pin can serve as an external interrupt source.
RTS: RTS flow control signal used by enhanced UART.
Bit
Read/Write
Initial Value
Port Pin
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
7
JTD
R/W
0
Alternate Functions
OC0A/OC1C/PCINT7/RTS (Output Compare and PWM Output A for
Timer/Counter0, Output Compare and PWM Output C for Timer/Counter1 or Pin
Change Interrupt 7 or UART flow control RTS signal)
OC1B/PCINT6/OC.4B/ADC13 (Output Compare and PWM Output B for
Timer/Counter1 or Pin Change Interrupt 6 or Timer 4 Output Compare B / PWM
output or Analog to Digital Converter channel 13)
OC1A/PCINT5/OC.4B/ADC12 (Output Compare and PWM Output A for
Timer/Counter1 or Pin Change Interrupt 5 or Timer 4 Complementary Output
Compare B / PWM output or Analog to Digital Converter channel 12)
PCINT4/ADC11 (Pin Change Interrupt 4 or Analog to Digital Converter channel 11)
PDO/MISO/PCINT3 (Programming Data Output or SPI Bus Master Input/Slave
Output or Pin Change Interrupt 3)
PDI/MOSI/PCINT2 (Programming Data Input or SPI Bus Master Output/Slave Input
or Pin Change Interrupt 2)
SCK/PCINT1 (SPI Bus Serial Clock or Pin Change Interrupt 1)
SS/PCINT0 (SPI Slave Select input or Pin Change Interrupt 0)
Port B Pins Alternate Functions
6
–
R
0
for more details about this feature.
5
–
R
0
4
PUD
R/W
0
3
–
R
0
Table
2
–
R
0
10-3.
1
IVSEL
R/W
0
ATmega16/32U4
0
IVCE
R/W
0
MCUCR
“Con-
72