[PIC] Bit Time Calculations for the Microchip CAN

다음은 44Hz의 주파수를 가지고 있는 PIC의 CAN 컨트롤을 하기 위한 것입니다. 

다음과 같이 설정을 하면 됩니다. 

Bit Time Calculations for the Microchip CAN

 

Setup Criteria

Oscilator Frequency	44.000 MHz
Target CAN Bus Baud Rate	500.000 kbps

 

Selected Options

BRP-1 (Baud Rate Prescaler)	1
Tq (Time Quanta)	90.909 ns
Number of Time Quanta	22
% Error of Target Baud Rate	0.0 % (Actual Baud Rate is 500.000 kbps )

 

Bit Timing Setup in Tq

Propagation Delay	5
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'10111100'	0xBC
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'0000011110111100'	0x07BC