Datasheet

39.8.8 Nominal Bit Timing and Prescaler
Name: NBTP
Offset: 0x1C
Reset: 0x00000A33
Property: Write-restricted
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 385 time quanta. The CAN time quantum may
be programmed in the range of 1 to 512 GCLK_CAN periods. t
q
= (NBRP + 1) mtq.
Note: With a CAN clock (GCLK_CAN) of 8MHz, the reset value 0x06000A03 configures the CAN for a
bit rate of 500 kBits/s.
Bit 31 30 29 28 27 26 25 24
NSJW[6:0] NBRP[8:8]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 1 1 0
Bit 23 22 21 20 19 18 17 16
NBRP[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8
NTSEG1[7:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 1 0 1 0
Bit 7 6 5 4 3 2 1 0
NTSEG2[6:0]
Access
R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 1 1
Bits 31:25 – NSJW[6:0] Nominal (Re)Syncronization Jump Width
Value Description
0x00 -
0x7F
Valid values are 0 to 127. The actual interpretation by the hardware of this value is such that
one more than the programmed value is used.
Bits 24:16 – NBRP[8:0] Nominal Baud Rate Prescaler
Value Description
0x000 -
0x1FF
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 511. The actual interpretation by the hardware of this value is such that one more than
the value programmed here is used.
Bits 15:8 – NTSEG1[7:0] Nominal Time segment before sample point
SAM D5x/E5x Family Data Sheet
CAN - Control Area Network
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1243