Datasheet

7734Q–AVR–02/12

AT90PWM81/161

Table 2-2. Pin out description.

2.1 Pin Descriptions

2.1.1 V

Digital supply voltage.

2.1.2 GND

Ground.

2.1.3 Port B (PB7..PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port B also serves the functions of various special features of the AT90PWM81/161 as listed on

Table 9-3 on page 75.

Port

SO 20

pins

QFN32

pins GP PSC ADC Analog

PB0 1 30 T1 PSCOUT23 ACMP3_OUT

PE0 2 31 RESET# OCD, INT2

PD0 NA 2 CLKO, SS ACMP3_OUT_A

PB1 3 3 PSCOUT20

PB2 4 4 INT0 PSCOUT21

VCC 5 5 Power Supply

GND 6 6 Ground

PE1 7 7 XTAL1 PSCIN2 ACMP1_OUT

PE2 8 10 XTAL2 PSCINr ACMP1M

PD1 9 11

PSCOUTR0,

PSCINrB

PD2 10 12 ADC0 ACMP1

PD3NA 13 ADC1ACMP2_OUT

PB3 11 14 PSCOUTR1 ADC2 ACMP2M

PB4 12 15 MOSI ADC3 ACMPM

PD4 NA 18 PSCIN2A ADC4 ACMP3M

PB5 13 19 INT1, SCK ADC5 ACMP2

AVCC 14 20 Analog Supply

AGND 15 21 Analog Ground

16 22 AREF, Analog Ref ADC6

PD5 17 23 ADC7 AMP0-

PD6 18 26 AMP0+

PB6 19 27 MISO ADC8 ACMP3

PD7 NA 28 PSCINrA ADC10