MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 525

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

The synchronization jump width (see the Bosch CAN 2.0A/B specification for details) can be programmed
in a range of 1 to 4 time quanta by setting the SJW parameter.
The SYNC_SEG, TSEG1, TSEG2, and SJW parameters are set by programming the MSCAN bus timing
registers (CANBTR0, CANBTR1) (see
and
Table 16-37
related parameter values.
16.4.4
16.4.4.1
The MSCAN module behaves as described within this specification in all normal system operating modes.
Write restrictions exist for some registers.
Freescale Semiconductor
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
Section 16.3.2.4, “MSCAN Bus Timing Register 1
Time Segment 1
Modes of Operation
gives an overview of the Bosch CAN 2.0A/B specification compliant segment settings and the
Normal System Operating Modes
5 .. 10
4 .. 11
5 .. 12
6 .. 13
7 .. 14
8 .. 15
9 .. 16
It is the user’s responsibility to ensure the bit time settings are in compliance
with the CAN standard.
Transmit Point
Sample Point
Table 16-37. Bosch CAN 2.0A/B Compliant Bit Time Segment Settings
SYNC_SEG
Syntax
TSEG1
3 .. 10
4 .. 11
5 .. 12
6 .. 13
7 .. 14
8 .. 15
4 .. 9
MC9S12G Family Reference Manual, Rev.1.01
System expects transitions to occur on the CAN bus during this
period.
A node in transmit mode transfers a new value to the CAN bus at
this point.
A node in receive mode samples the CAN bus at this point. If the
three samples per bit option is selected, then this point marks the
position of the third sample.
Table 16-36. Time Segment Syntax
Time Segment 2
Section 16.3.2.3, “MSCAN Bus Timing Register 0
2
3
4
5
6
7
8
NOTE
(CANBTR1)”).
Freescale’s Scalable Controller Area Network (S12MSCANV3)
Description
TSEG2
1
2
3
4
5
6
7
Synchronization
Jump Width
1 .. 2
1 .. 3
1 .. 4
1 .. 4
1 .. 4
1 .. 4
1 .. 4
(CANBTR0)”
0 .. 1
0 .. 2
0 .. 3
0 .. 3
0 .. 3
0 .. 3
0 .. 3
SJW
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