S912XEP100J5MAGR Freescale Semiconductor, S912XEP100J5MAGR Datasheet - Page 652

Manufacturer Part Number

S912XEP100J5MAGR

S912XEP Series 16 Bit 50 Mhz 1 MB Flash 64 KB Ram Microcontroller - LQFP-144

Manufacturer

Freescale Semiconductor

Manufacturer

BOSTOCK HK LIMITED

Part Number:

S912XEP100J5MAGR

Manufacturer:

Freescale Semiconductor

Chapter 16 Freescale’s Scalable Controller Area Network (S12MSCANV3)

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

related parameter values.

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

Write restrictions exist for some registers.

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

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

MC9S12XE-Family Reference Manual , Rev. 1.23

System expects transitions to occur on the CAN bus during this

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

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

(CANBTR1)”).

Synchronization

Freescale Semiconductor