AT90USB646_0607 datasheet(82/435 Pages) ATMEL

82 / 435 page

7593D–AVR–07/06

AT90USB64/128

Note:

1. ADA is short for ADdress Active and represents the time when address is output. See “Exter-

nal Memory Interface” on page 30 for details.

10.3.3

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 10-6.

The alternate pin configuration is as follows:

• OC0A/OC1C/PCINT7, 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.

Table 10-5.

Overriding Signals for Alternate Functions in PA3..PA0

Signal

Name

PA3/AD3

PA2/AD2

PA1/AD1

PA0/AD0

PUOE

SRE

PUOV

~(WR | ADA) •

PORTA3 • PUD

~(WR | ADA) •

PORTA2 • PUD

~(WR | ADA) •

PORTA1 • PUD

~(WR | ADA) •

PORTA0 • PUD

DDOE

SRE

DDOV

WR | ADA

PVOE

SRE

PVOV

A3 • ADA | D3

OUTPUT • WR

A2• ADA | D2

OUTPUT • WR

A1 • ADA | D1

OUTPUT • WR

A0 • ADA | D0

OUTPUT • WR

DIEOE

DIEOV

D3 INPUT

D2 INPUT

D1 INPUT

D0 INPUT

AIO

–

Table 10-6.

Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

OC0A/OC1C/PCINT7 (Output Compare and PWM Output A for Timer/Counter0,

Output Compare and PWM Output C for Timer/Counter1 or Pin Change Interrupt 7)

PB6

OC1B/PCINT6 (Output Compare and PWM Output B for Timer/Counter1 or Pin

Change Interrupt 6)

PB5

OC1A/PCINT5 (Output Compare and PWM Output A for Timer/Counter1 or Pin

Change Interrupt 5)

PB4

OC2A/PCINT4 (Output Compare and PWM Output A for Timer/Counter2 or Pin

Change Interrupt 4)

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 orSPI 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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