[PIC] Bit Time Calculations for the Microchip CAN [40Mhz]

Bit Time Calculations for the Microchip CAN

 

Setup Criteria

Oscilator Frequency	40.000 MHz
Target CAN Bus Baud Rate	500.000 kbps

 

Selected Options

BRP-1 (Baud Rate Prescaler)	1
Tq (Time Quanta)	100.000 ns
Number of Time Quanta	20
% Error of Target Baud Rate	0.0 %

 

Bit Timing Setup in Tq

Propagation Delay	3
Phase Segment 1	8
Phase Segment 2	8
Syncronization Jump Width (SJW)	1

Multiple bit sampling is off. Wakeup filter is off.

Bit Timing Diagram

 

Configuration Register Setup (PIC18/MCP251X) (neoVI blue/green, ValueCAN 2)

Register	Binary	Hexadecimal
CNF1/BRGCON1	b'00000001'	0x01
CNF2/BRGCON2	b'10111010'	0xBA
CNF3/BRGCON3	b'00000111'	0x07

Configuration Register Setup (dsPIC33F,PIC24H,dsPIC30) (neoVI Red/Fire/Test/Yellow/ECU, ValueCAN 3)

Register	Binary	Hexadecimal
CICFG1	b'0000000000000001'	0x0001
CICFG2	b'0000011110111010'	0x07BA