38.8.4 Data Bit Timing and Prescaler

This register is write-restricted and only writable if bit fields CCCR.CCE = 1 and CCCR.INIT = 1.

The CAN bit time may be programmed in the range of 4 to 49 time quanta. The CAN time quantum may be programmed in the range of 1 to 32 GCLK_CAN periods. tq = (DBRP + 1) mtq.

Note:

With a GCLK_CAN of 8MHz, the reset value 0x00000A33 configures the CAN for a fast bit rate of 500 kBits/s.

The bit rate configured for the CAN FD data phase via DBTP must be higher or equal to the bit rate configured for the arbitration phase via NBTP.

Name: DBTP
Offset: 0x0C
Reset: 0x00000A33
Property: Write-restricted

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
 TDC  DBRP[4:0] 
Access R/WR/WR/WR/WR/WR/W 
Reset 000000 
Bit 15141312111098 
    DTSEG1[4:0] 
Access R/WR/WR/WR/WR/W 
Reset 01010 
Bit 76543210 
 DTSEG2[3:0]DSJW[3:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset 00110011 

Bit 23 – TDC Transceiver Delay Compensation

ValueDescription
0 Transceiver Delay Compensation disabled.
1 Transceiver Delay Compensation enabled.

Bits 20:16 – DBRP[4:0] Data Baud Rate Prescaler

ValueDescription
0x00 - 0x1F The value by which the oscillator frequency is divided for generating the bit time quanta. The bit time is built up from a multiple of this quanta. Valid values for the Baud Rate Prescaler are 0 to 31. The actual interpretation by the hardware of this value is such that one more than the value programmed here is used.

Bits 12:8 – DTSEG1[4:0] Fast time segment before sample point

ValueDescription
0x00 - 0x1F Valid values are 0 to 31. The actual interpretation by the hardware of this value is such that one more than the programmed value is used. DTSEG1 is the sum of Prop_Seg and Phase_Seg1.

Bits 7:4 – DTSEG2[3:0] Data time segment after sample point

ValueDescription
0x0 - 0xF Valid values are 0 to 15. The actual interpretation by the hardware of this value is such that one more than the programmed value is used. DTSEG2 is Phase_Seg2.

Bits 3:0 – DSJW[3:0] Data (Re)Syncronization Jump Width

ValueDescription
0x0 - 0xF Valid values are 0 to 15. The actual interpretation by the hardware of this value is such that one more than the programmed value is used.