Datasheet
CLOCK CIRCUIT:
Quartz crystal 16 MHz is connected to AT90CAN128 pin 24 (XTAL1) and pin 23
(XTAL2).
Quartz crystal 32.768 kHz is connected to AT90CAN128 pin 19 (TOSC1/PG4) and
pin 18 (TOSC2/PG3) and supplies the internal Asynchronous Timer/Counter
(Timer/Counter2 in asynchronous operation).
JUMPER DESCRIPTION:
CAN_D
CAN Disable. If this jumper is closed, the CAN is disabled.
Default state is open.
CAN_T
This jumper assures correct work of the CAN. At each end of the bus
it should be closed. This means that if you have only two devices
with CAN, the jumpers of both devices should be closed. If you have
more than two devices, only the two end-devices should be closed.
Default state is closed.
AVREF_E
This jumper when closed supplies VDDA reference to the AVREF. If
this jumper is open the desired reference voltage should be applied at
EXT2-3.
Default state is open.
INPUT/OUTPUT:
Status LED (red) with name STAT connected to AT90CAN128 pin 6
(OC3B/INT4/PE4).
Power-on LED (red) with name PWR_LED – this LED shows that +5V is applied to
the board.
User button with name BUT connected to AT90CAN128 pin 7 (OC3C/INT5/PE5).
Reset button with name RST connected to AT90CAN128 pin 20 (#RESET).
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