PC912XDP512F0CFVR datasheet(466/1348 Pages) FREESCALE

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Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3)

MC9S12XDP512 Data Sheet, Rev. 2.21

466

Freescale Semiconductor

The synchronization jump width (see the Bosch CAN 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 Section 10.3.2.3, “MSCAN Bus Timing Register 0 (CANBTR0)”

and Section 10.3.2.4, “MSCAN Bus Timing Register 1 (CANBTR1)”).

Table 10-35 gives an overview of the CAN compliant segment settings and the related parameter values.

NOTE

It is the user’s responsibility to ensure the bit time settings are in compliance

with the CAN standard.

10.4.4

Modes of Operation

10.4.4.1

Normal Modes

The MSCAN module behaves as described within this speciﬁcation in all normal system operation modes.

10.4.4.2

Special Modes

The MSCAN module behaves as described within this speciﬁcation in all special system operation modes.

Table 10-34. Time Segment Syntax

Syntax

Description

SYNC_SEG

System expects transitions to occur on the CAN bus during this

period.

Transmit Point

A node in transmit mode transfers a new value to the CAN bus at

this point.

Sample 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 10-35. CAN Standard Compliant Bit Time Segment Settings

Time Segment 1

TSEG1

Time Segment 2

TSEG2

Synchronization

Jump Width

SJW

5 .. 10

4 .. 9

1 .. 2

0 .. 1

4 .. 11

3 .. 10

1 .. 3

0 .. 2

5 .. 12

4 .. 11

1 .. 4

0 .. 3

6 .. 13

5 .. 12

1 .. 4

0 .. 3

7 .. 14

6 .. 13

1 .. 4

0 .. 3

8 .. 15

7 .. 14

1 .. 4

0 .. 3

9 .. 16

8 .. 15

1 .. 4

0 .. 3

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