AT90PWM216 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
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AT90PWM216 Datasheet PDF : 28 Pages
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3.2.6
Port E (PE2..0) RESET/ XTAL1/
XTAL2
Port E is an 3-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port E output buf-
fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port E pins that are
externally pulled low will source current if the pull-up resistors are activated. The Port E pins are tri-stated when a
reset condition becomes active, even if the clock is not running.
If the RSTDISBL Fuse is programmed, PE0 is used as an I/O pin. Note that the electrical characteristics of PE0 dif-
fer from those of the other pins of Port C.
If the RSTDISBL Fuse is unprogrammed, PE0 is used as a Reset input. A low level on this pin for longer than the
minimum pulse length will generate a Reset, even if the clock is not running. The minimum pulse length is given in
Table 8-1 on page 41. Shorter pulses are not guaranteed to generate a Reset.
Depending on the clock selection fuse settings, PE1 can be used as input to the inverting Oscillator amplifier and
input to the internal clock operating circuit.
Depending on the clock selection fuse settings, PE2 can be used as output from the inverting Oscillator amplifier.
The various special features of Port E are elaborated in “Alternate Functions of Port E” on page 71 and “Clock Sys-
tems and their Distribution” on page 25.
3.2.7
AVCC
AVCC is the supply voltage pin for the A/D Converter. It should be externally connected to VCC, even if the ADC is
not used. If the ADC is used, it should be connected to VCC through a low-pass filter.
3.2.8 AREF
This is the analog reference pin for the A/D Converter.
3.3 About Code Examples
This documentation contains simple code examples that briefly show how to use various parts of the device. These
code examples assume that the part specific header file is included before compilation. Be aware that not all C
compiler vendors include bit definitions in the header files and interrupt handling in C is compiler dependent.
Please confirm with the C compiler documentation for more details.
AT90PWM216/316 [DATASHEET] 10
7710HS–AVR–07/2013
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