ATMEGA3250SLASHV datasheet(59/347 Pages) ATMEL

59 / 347 page

ATmega325/3250/645/6450

2570A–AVR–09/04

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 “Configuring the Pin” on page 53 for more details about this feature.

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 26.

The alternate pin configuration is as follows:

• OC2A/PCINT15, Bit 7

OC2, Output Compare Match A output: The PB7 pin can serve as an external output for

the Timer/Counter2 Output Compare A. The pin has to be configured as an output

(DDB7 set (one)) to serve this function. The OC2A pin is also the output pin for the PWM

mode timer function.

PCINT15, Pin Change Interrupt source 15: The PB7 pin can serve as an external inter-

rupt source.

• OC1B/PCINT14, Bit 6

OC1B, Output Compare Match B output: The PB6 pin can serve as an external output

for the Timer/Counter1 Output Compare B. The pin has to be configured as an output

(DDB6 set (one)) to serve this function. The OC1B pin is also the output pin for the PWM

mode timer function.

PCINT14, Pin Change Interrupt Source 14: The PB6 pin can serve as an external inter-

rupt source.

Bit

JTD

–

–PUD

–

IVSEL

IVCE

MCUCR

Read/Write

R/W

Initial Value

Table 26. Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

OC2A/PCINT15 (Output Compare and PWM Output A for Timer/Counter2 or

Pin Change Interrupt15).

PB6

OC1B/PCINT14 (Output Compare and PWM Output B for Timer/Counter1 or

Pin Change Interrupt14).

PB5

OC1A/PCINT13 (Output Compare and PWM Output A for Timer/Counter1 or

Pin Change Interrupt13).

PB4

OC0A/PCINT12 (Output Compare and PWM Output A for Timer/Counter0 or

Pin Change Interrupt12).

PB3

MISO/PCINT11 (SPI Bus Master Input/Slave Output or Pin Change

Interrupt11).

PB2

MOSI/PCINT10 (SPI Bus Master Output/Slave Input or Pin Change

Interrupt10).

PB1

SCK/PCINT9 (SPI Bus Serial Clock or Pin Change Interrupt9).

PB0

SS/PCINT8 (SPI Slave Select input or Pin Change Interrupt8).

ATMEGA3250/V Datasheet(PDF) 59 Page - ATMEL Corporation

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