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AT90S2313 Datasheet(PDF) 3 Page - ATMEL Corporation

Part No. AT90S2313
Description  8-bit Microcontroller with 2K Bytes of In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT90S2313
3
Pin Descriptions
VCC
Supply voltage pin.
GND
Ground pin.
Port B (PB7..PB0)
Port B is an 8-bit bi-directional I/O port. Port pins can pro-
vide internal pull-up resistors (selected for each bit). PB0
and PB1 also serve as the positive input (AIN0) and the
negative input (AIN1), respectively, of the on-chip analog
comparator. The Port B output buffers can sink 20mA and
can drive LED displays directly. When pins PB0 to PB7 are
used as inputs and are externally pulled low, they will
source current if the internal pull-up resistors are activated.
Port B also serves the functions of various special features
of the AT90S2313 as listed on page 38.
Port D (PD6..PD0)
Port D has seven bi-directional I/O pins with internal pull-up
resistors, PD6..PD0. The Port D output buffers can sink 20
mA. As inputs, Port D pins that are externally pulled low will
source current if the pull-up resistors are activated.
Port D also serves the functions of various special features
of the AT90S2313 as listed on page 43.
RESET
Reset input. A low on this pin for two machine cycles while
the oscillator is running resets the device.
XTAL1
Input to the inverting oscillator amplifier and input to the
internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier
Crystal Oscillator
XTAL1 and XTAL2 are input and output, respectively, of an
inverting amplifier which can be configured for use as an
on-chip oscillator, as shown in Figure 2. Either a quartz
crystal or a ceramic resonator may be used. To drive the
device from an external clock source, XTAL2 should be left
unconnected while XTAL1 is driven as shown in Figure 3.
Figure 2. Oscillator Connections
Figure 3. External Clock Drive Configuration




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