NXP Semiconductors KE1xF Series, Reference Manual, Page: 1457 / 1483

range of 2 to 16 time quanta. When CAN_CBT[BTF] bit is asserted, FlexCAN uses
EPROPSEG and EPSEG1 fields from CAN_CBT register so that their sum (plus 2)
is in the range of 2 to 96 time quanta.
• Time Segment 2: This segment represents the Phase Segment 2 of the CAN standard.
It can be programmed by setting the PSEG2 field of the CAN_CTRL1 Register (plus
1) to be 2 to 8 time quanta long. When CAN_CBT[BTF] bit is asserted, FlexCAN
uses EPSEG2 fields of CAN_CBT register so that its value (plus 1) is in the range of
2 to 32 time quanta. The Time Segment 2 cannot be smaller than the Information
Processing Time (IPT), which value is 2 time quanta in FlexCAN.
NOTE
The bit time defined by the above time segments must not be
smaller than 5 time quanta. For bit time calculations, use an
Information Processing Time (IPT) of 2, which is the value
implemented in the FlexCAN module.
S Y N C _S E G
Time Segment 2
2 ... 8
8 ... 25 Time Quanta
= 1 Bit Time
Sample Point
(single or triple sampling)
Transmit Point
Time Segment 1
1 2 ... 16
NRZ Signal
Tq Tq
(P PSEG1 + 2)
(PSEG2 + 1)
Figure 50-3. Segments within the bit time (example using CAN_CTRL1 bit timing
variables for Classical CAN format)
Table 50-14. Time segment syntax
Syntax Description
SYNC_SEG System expects transitions to occur on the bus during this period.
TSEG1 Corresponds to the sum of PROPSEG and PSEG1.
Table continues on the next page...
Chapter 50 CAN (FlexCAN)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors 1457