MC908AZ60ACFUER Datasheet, PDF (280/414 Pages) Freescale Semiconductor, Inc – To provide the most up-to-date information, the revision of our documents on the World Wide Web will be the most current. Your printed copy may be an earlier revision. To verify you have the latest information available, refer to:

MSCAN Controller (MSCAN08)
• Time segment 2: This segment represents PHASE_SEG2 of the CAN standard. It can be
programmed by setting the TSEG2 parameter to be 2 to 8 time quanta long.
f_Tq
Bit rate=
No. of time quanta
The synchronization jump width (SJW) can be programmed in a range of 1 to 4 time quanta by setting the
SJW parameter.
The above parameters can be set by programming the bus timing registers, CBTR0–CBTR1, see 23.13.3
MSCAN08 Bus Timing Register 0 and 23.13.4 MSCAN08 Bus Timing Register 1).
NOTE
It is the user’s responsibility to make sure that the bit timing settings are in
compliance with the CAN standard,
Table 23-8 gives an overview on the CAN conforming segment settings and the related parameter values.
NRZ SIGNAL
SYNC
_SEG
1
TIME SEGMENT 1
(PROP_SEG + PHASE_SEG1)
4 ... 16
8... 25 TIME QUANTA
= 1 BIT TIME
TIME SEG. 2
(PHASE_SEG2)
2 ... 8
SAMPLE POINT
(SINGLE OR TRIPLE SAMPLING)
Figure 23-8. Segments within the Bit Time
.
Table 23-3Time Segment Syntax
SYNC_SEG
Transmit point
Sample point
System expects transitions to occur on the bus
during this period.
A node in transmit mode will transfer a new
value to the CAN bus at this point.
A node in receive mode will sample the bus at
this point. If the three samples per bit option is
selected then this point marks the position of
the third sample.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
280
Freescale Semiconductor