ATmega16U4 datasheet(71/408 Pages) ATMEL

71 / 408 page

7766D–AVR–01/09

ATmega16U4/ATmega32U4

10.3.1

MCU Control Register – MCUCR

• 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 “Con-

figuring the Pin” on page 65 for more details about this feature.

10.3.2

Alternate Functions of Port B

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.

• OC1B/PCINT6/OC.4B/ADC12, Bit 6

Bit

JTD

–

–PUD

–

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

Table 10-3.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

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)

PB6

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)

PB5

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)

PB4

PCINT4/ADC11 (Pin Change Interrupt 4 or Analog to Digital Converter channel 11)

PB3

PDO/MISO/PCINT3 (Programming Data Output or SPI Bus Master Input/Slave

Output or Pin Change Interrupt 3)

PB2

PDI/MOSI/PCINT2 (Programming Data Input or SPI Bus Master Output/Slave Input

or Pin Change Interrupt 2)

PB1

SCK/PCINT1 (SPI Bus Serial Clock or Pin Change Interrupt 1)

PB0

SS/PCINT0 (SPI Slave Select input or Pin Change Interrupt 0)

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