MCP2515DM-PCTL Microchip Technology, MCP2515DM-PCTL Datasheet - Page 13

• Manufacturer Part Number: MCP2515DM-PCTL
• Description: BOARD DEMO FOR MCP2515
• Manufacturer: Microchip Technology
• Series: PICtail™r
• Type: Network Controller & Processorr

Specifications of MCP2515DM-PCTL

• Main Purpose: Interface, CAN Controller
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP2515, MCP25020
• Primary Attributes: Stand alone CAN Controller with CAN I/O Expander
• Interface Type: CAN
• Operating Voltage: 5 V
• Product: Modules
• For Use With/related Products: MCP2515, MCP25020
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.4
© 2005 Microchip Technology Inc.
FIRMWARE DESCRIPTION
See Figure 2-2 and Figure 2-3 for a simple firmware flow diagram for Node A (Node B
does not contain any firmware).
1. The firmware first configures the PIC16F676 and the MCP2515.
2. The firmware then checks a global flag bit to determine if a message needs to be
3. The firmware checks a global receive flag bit to determine if a message has been
4. The firmware loops back to #2.
FIGURE 2-2:
sent (a message containing the input button value is transmitted once every
224 ms).
2a. Node A sends a message to Node B requesting I/O status (i.e., push button
status).
received by the MCP2515. If yes, the data is read and the LED is set accordingly.
FIRMWARE FLOW DIAGRAM
ServiceIO
InitMCU
Init2515
Start
Installation and Operation
MAIN
DS51572A-page 9