s908az32ag2cfue Freescale Semiconductor, Inc, s908az32ag2cfue Datasheet - Page 276

• Manufacturer Part Number: s908az32ag2cfue
• Description: M68hc08 Microcontrollers 8-bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

MSCAN Controller (MSCAN08)
The above parameters can be set by programming the bus timing registers, CBTR0–CBTR1, see
MSCAN08 Bus Timing Register 0
Table 24-8
276
gives an overview on the CAN conforming segment settings and the related parameter values.
Segment 1
Transmit point
Sample point
5 .. 10
4 .. 11
5 .. 12
6 .. 13
7 .. 14
8 .. 15
9 .. 16
SYNC_SEG
Time
It is the user’s responsibility to make sure that the bit timing settings are in
compliance with the CAN standard,
Table 24-4. CAN Standard Compliant Bit Time Segment Settings
SYNC
_SEG
1
NRZ SIGNAL
TSEG1
3 .. 10
4 .. 11
5 .. 12
6 .. 13
7 .. 14
8 .. 15
4 .. 9
Figure 24-8. Segments within the Bit Time
A node in transmit mode will transfer a new value to the CAN bus at this point.
per bit option is selected then this point marks the position of the third sample.
A node in receive mode will sample the bus at this point. If the three samples
8... 25 TIME QUANTA
= 1 BIT TIME
Table 24-3. Time Segment Syntax
and
MC68HC908AZ32A Data Sheet, Rev. 2
(PROP_SEG + PHASE_SEG1)
System expects transitions to occur on the bus during this period.
24.13.4 MSCAN08 Bus Timing Register
TIME SEGMENT 1
Segment 2
Time
4 ... 16
2
3
4
5
6
7
8
NOTE
.
TSEG2
1
2
3
4
5
6
7
SAMPLE POINT
(SINGLE OR TRIPLE SAMPLING)
(PHASE_SEG2)
TIME SEG. 2
Synchronization
2 ... 8
Jump Width
1 .. 2
1 .. 3
1 .. 4
1 .. 4
1 .. 4
1 .. 4
1 .. 4
1).
Freescale Semiconductor
SJW
0 .. 1
0 .. 2
0 .. 3
0 .. 3
0 .. 3
0 .. 3
0 .. 3
24.13.3