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MCP2515 Development Kit User’s Guide
5.3.2
PC Node Distributed (one node, on CAN bus)
This configuration is the same as above, with the exception that it is connected to an
external CAN bus via the CAN connector (DB9).
Typically, this configuration would be used to further evaluate the MCP2515 by
observing how it functions on an external CAN bus. Experimentation with bit timings,
masks and filters, interrupts, RTS pins, etc. can be performed while using the Register
template. While in the configuration, simple bus monitoring can be achieved using the
Basic template.
5.3.3
Two Node Embedded System
This configuration utilizes node 0 and node 1 to create a two node, embedded system
(no external bus).
This configuration can be used for evaluation or development. The microcontroller
firmware is being developed at this point. As an example, the firmware may be written
to observe how the MCP2515 uses masks and filters to accept/reject messages. SPI
modules and interrupt handlers may be under development at this stage.
5.3.4
Two Node Distributed System
This configuration places both nodes on the CAN bus.
One scenario utilizes the microcontroller node as the node under development, while
the PC node is simply a bus monitor to assist in debugging.
5.3.5
Microcontroller Distributed System (One Node)
This configuration places the microcontroller node (node 1) on the CAN bus.
5.4
OSCILLATOR CONFIGURATIONS
There are three oscillator sockets. By default, both MCP2515s and the PICmicro ?
MCU sockets use a common oscillator. Since all three socket outputs are tied together,
the oscillator can be placed in any socket.
Warning: Care must be taken when installing more than one oscillator. The jumper
settings must be correct or contention will occur at some or all of the
device oscillator inputs. This could have catastrophic results.
It is possible for each node and the microcontrollers to have their own oscillator by
configuring the jumpers as described later in this chapter.
DS51416A-page 30
? 2003 Microchip Technology Inc.
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