70353C datasheet(62/76 Pages) MICROCHIP

62 / 76 page

dsPIC33E/PIC24E Family Reference Manual

DS70353C-page 21-62

Example 21-9:

Code Example for Configuring ECAN™ Bit Timing Parameters

/* This code snippet shows an example of configuring the ECAN module to

operate at 1 Mbps while the device is operating at 40 MHz */

/* Set the Operating Frequency of the device to be 40 MHz */

#define FP 40000000

/* Set the ECAN module for Configuration Mode before writing into the Baud

Rate Control Registers */

C1CTRL1bits.REQOP = 4;

/* Wait for the ECAN module to enter into Configuration Mode */

while(C1CTRL1bits.OPMODE! = 4);

/* FCAN is selected to be FP by clearing the CANCKS bit

/* FCAN = FP = 40 MHz */

C1CTRL1bits.CANCKS = 0x0;

/* Phase Segment 1 time is 8 TQ */

C1CFG2bits.SEG1PH = 0x7;

/* Phase Segment 2 time is set to be programmable */

C1CFG2bits.SEG2PHTS = 0x1;

/* Phase Segment 2 time is 6 TQ */

C1CFG2bits.SEG2PH = 0x5;

/* Propagation Segment time is 5 TQ */

C1CFG2bits.PRSEG = 0x4;

/* Bus line is sampled three times at the sample point */

C1CFG2bits.SAM = 0x1;

/* Synchronization Jump Width set to 4 TQ */

C1CFG1bits.SJW = 0x3;

/* Baud Rate Prescaler bits set to 1:1, (i.e., TQ = (2*1*1)/FCAN) */

C1CFG1bits.BRP = 0x0;

/* Put the ECAN Module into Normal Operating Mode */

C1CTRL1bits.REQOP = 0;

/* Wait for the ECAN module to enter into Normal Operating Mode */

while(C1CTRL1bits.OPMODE! = 0);

70353C Datasheet(PDF) 62 Page - Microchip Technology