PC312XDP512F0CFVR datasheet(452/1348 Pages) FREESCALE

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

MC9S12XDP512 Data Sheet, Rev. 2.21

452

Freescale Semiconductor

10.3.3.1.2

IDR0–IDR3 for Standard Identiﬁer Mapping

76543210

ID6

ID5

ID4

ID3

ID2

ID1

ID0

RTR

Reset:

xxxxxxxx

Figure 10-29. Identiﬁer Register 3 (IDR3) — Extended Identiﬁer Mapping

Table 10-28. IDR3 Register Field Descriptions — Extended

Field

Description

7:1

ID[6:0]

Extended Format Identiﬁer — The identiﬁers consist of 29 bits (ID[28:0]) for the extended format. ID28 is the

most signiﬁcant bit and is transmitted ﬁrst on the CAN bus during the arbitration procedure. The priority of an

identiﬁer is deﬁned to be highest for the smallest binary number.

RTR

Remote Transmission Request — This ﬂag reﬂects the status of the remote transmission request bit in the

CAN frame. In the case of a receive buffer, it indicates the status of the received frame and supports the

transmission of an answering frame in software. In the case of a transmit buffer, this ﬂag deﬁnes the setting of

the RTR bit to be sent.

0 Data frame

1 Remote frame

76543210

ID10

ID9

ID8

ID7

ID6

ID5

ID4

ID3

Reset:

xxxxxxxx

Figure 10-30. Identiﬁer Register 0 — Standard Mapping

Table 10-29. IDR0 Register Field Descriptions — Standard

Field

Description

7:0

ID[10:3]

Standard Format Identiﬁer — The identiﬁers consist of 11 bits (ID[10:0]) for the standard format. ID10 is the

most signiﬁcant bit and is transmitted ﬁrst on the CAN bus during the arbitration procedure. The priority of an

identiﬁer is deﬁned to be highest for the smallest binary number. See also ID bits in Table 10-30.

76543210

ID2

ID1

ID0

RTR

IDE (=0)

Reset:

xxxxxxxx

= Unused; always read ‘x’

Figure 10-31. Identiﬁer Register 1 — Standard Mapping

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