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CHAPTER 16 CAN controller
I Definition of Bit Timing Segment
Bit timing is set in the bit timing register (BTR).Figure 16.3-10 and Figure 16.3-11 show the segments of
the nominal bit time (one bit of time within message) and bit timing register (BTR).
G
Bit time segments of general CAN specifications
SYNC_SEG
(sync segment)
• SYNC_SEG (sync segment): Synchronization is performed to shorten or prolong the bit time.
• PROP_SEG (propagation segment): The physical delay among networks is adjusted.
• PHASE_SEG (phase segment): The phase shift due to oscillation errors is adjusted.
G
Bit time segments of Fujitsu CAN controller
The propagation segment (PROP_SEG) and phase segment 1 (PHASE_SEG1) are used as a single segment
of time segment 1 (TSEG1).The phase segment 2 (PHASE_SEG2) is used as the time segment 2 (TSEG2).
SYNC_SEG
(sync segment)
• TSEG1 = PROP_SEG + PHASE_SEG1
• TSEG2 = PHASE_SEG2
496
Figure 16.3-10 Bit Time Segments of CAN Specifications
nominal bit time
PROP_SEG
(propagetion segment)
Figure 16.3-11 Bit Time Segments of CAN Controller
(time segment 1)
PHASE_SEG1
(phase segment 1)
samplingpoint
nominal bit time
TSEG1
samplingpoint
PHASE_SEG2
(phase segment 2)
TSEG2
(time segment 2)
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