5
ATmega8515(L)
2512A–AVR–04/02
Pin Descriptions
VCC Digitalsupply voltage.
GND Ground.
Port A (PA7..PA0) PortAis an 8-bit bi-directionalI/Oport with internalpull-upresistors (selectedfor each
bit).ThePort A output buffers have symmetricaldrive characteristics withbothhighsink
andsource capability. When pins PA0toPA7 areused as inputs and areexternally
pulledlow, theywill source current if theinternalpull-upresistors areactivated.ThePort
A pins aretri-statedwhen a reset condition becomes active, even if the clock is not
running.
PortAalso serves the functions of variousspecialfeatures of the ATmega8515 aslisted
on page 64.
Port B (PB7..PB0) Port B is an 8-bit bi-directionalI/Oport with internalpull-upresistors (selectedfor each
bit).ThePort B output buffers have symmetricaldrive characteristics withbothhighsink
andsource capability.As inputs, Port Bpins that areexternally pulledlowwill source
current if the pull-upresistors areactivated.ThePort Bpins aretri-statedwhen a reset
condition becomes active, even if the clock is not running.
Port B also serves the functions of variousspecialfeatures of the ATmega8515 aslisted
on page 64.
Port C (PC7..PC0) Port C is an 8-bit bi-directionalI/Oport with internalpull-upresistors (selectedfor each
bit).ThePort C output buffers have symmetricaldrive characteristics withbothhighsink
andsource capability.As inputs, Port Cpins that areexternally pulledlowwill source
current if the pull-upresistors areactivated.ThePort Cpins aretri-statedwhen a reset
condition becomes active, even if the clock is not running.
Port D (PD7..PD0) Port D is an 8-bit bi-directionalI/Oport with internalpull-upresistors (selectedfor each
bit).ThePort D output buffers have symmetricaldrive characteristics withbothhighsink
andsource capability.As inputs, Port Dpins that areexternally pulledlowwill source
current if the pull-upresistors areactivated.ThePort Dpins aretri-statedwhen a reset
condition becomes active, even if the clock is not running.
Port D also serves the functions of variousspecialfeatures of the ATmega8515 aslisted
on page 69.
Port E(PE2..PE0) Port E is an 3-bit bi-directionalI/Oport with internalpull-upresistors (selectedfor each
bit).ThePort E output buffers have symmetricaldrive characteristics withbothhighsink
andsource capability.As inputs, Port Epins that areexternally pulledlowwill source
current if the pull-upresistors areactivated.ThePort Epins aretri-statedwhen a reset
condition becomes active, even if the clock is not running.
Port E also serves the functions of variousspecialfeatures of the ATmega8515 aslisted
on page 71.
RESET
Reset input. A lowlevel on thispin forlonger than the minimum pulse lengthwill gener-
ate a reset, even if the clock is not running. Theminimumpulse length is given in Table
18 on page 43. Shorterpulses are not guaranteed to generate a reset.
XTA L 1 Input to theinverting Oscillator amplifier and input to theinternalclock operating circuit.
XTA L 2 Output from theinverting Oscillator amplifier.
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