Microchip Technology dsPIC33 series - 5.3.5 SYNCHRONIZATION JUMP WIDTH; 5.3.6 OSCILLATOR TOLERANCE

 2018 Microchip Technology Inc. DS70005340A-page 63
CAN FD Protocol Module
5.3.5 SYNCHRONIZATION JUMP WIDTH
The Synchronization Jump Width (SJW) is the maximum amount that PHSEG1 and PHSEG2
can be adjusted during resynchronization. SJW is programmable (see Table 5 -1 and Table 5 - 2).
5.3.6 OSCILLATOR TOLERANCE
The oscillator tolerance, df, around the nominal frequency of the oscillator, f nom , is defined in
Equation 5-11.
Equation 5-12 through Equation 5-16 describe the conditions for the maximum tolerance of the
oscillator.
Equation 5-11: Oscillator Tolerance
Equation 5-12: Condition 1
Equation 5-13: Condition 2
Equation 5-14: Condition 3
Equation 5-15: Condition 4
Equation 5-16: Condition 5
1df–fnom F
SYSCLK
1df+fnom
df
NSJW
210
NBT
NTQ
------------

----------------------------------

df
min NPHSEG1 NPHSEG2,
213
NBT
NTQ
------------ NPHSEG2–



-------------------------------------------------------------------------

df
DSJW
210
DBT
DTQ
------------
----------------------------------

df
min NPHSEG1 NPHSEG2,
26
DBT
DTQ
------------ DPHSEG2–


DBRP
NBRP
----------------7
NBT
NTQ
------------+



--------------------------------------------------------------------------------------------------------------------------------

df
DSJW max 0
NBRP
DBRP
----------------1–


,


–
22
NBT
NTQ
------------ HNSEGP2


NBRP
DBRP
----------------DPHSEG24
DBT
DTQ
------------++



-------------------------------------------------------------------------------------------------------------------------------------------------------------------
