3

8048BS–AVR–03/09

capability except PA7 which has the RESET capability. To use pin PA7 as an I/O pin, instead of

RESET pin, program (‘0’) RSTDISBL fuse. As inputs, Port A pins that are externally pulled low

will source current if the pull-up resistors are activated. The Port A pins are tri-stated when a

reset condition becomes active, even if the clock is not running.

Port A has an alternate functions as analog inputs for the ADC, analog comparator, timer/coun-

1.1.4

RESET

Reset input. A low level on this pin for longer than the minimum pulse length will generate a

1.1.5

Port B (PB7:PB0)

Port B is a 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.

1.1.6

LSW

Boost converter external inductor connection. Connect to ground when boost converter is dis-

abled permanently.

1.1.7

V

BAT

Battery supply voltage. Connect to ground when boost converter is disabled permanently.