PC312XDP512F0CFVR datasheet(451/1348 Pages) FREESCALE

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

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

451

Table 10-25. IDR0 Register Field Descriptions — Extended

Field

Description

7:0

ID[28:21]

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.

76543210

ID20

ID19

ID18

SRR (=1)

IDE (=1)

ID17

ID16

ID15

Reset:

xxxxxxxx

Figure 10-27. Identiﬁer Register 1 (IDR1) — Extended Identiﬁer Mapping

Table 10-26. IDR1 Register Field Descriptions — Extended

Field

Description

7:5

ID[20:18]

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.

SRR

Substitute Remote Request — This ﬁxed recessive bit is used only in extended format. It must be set to 1 by

the user for transmission buffers and is stored as received on the CAN bus for receive buffers.

IDE

ID Extended — This ﬂag indicates whether the extended or standard identiﬁer format is applied in this buffer. In

the case of a receive buffer, the ﬂag is set as received and indicates to the CPU how to process the buffer

identiﬁer registers. In the case of a transmit buffer, the ﬂag indicates to the MSCAN what type of identiﬁer to send.

0 Standard format (11 bit)

1 Extended format (29 bit)

2:0

ID[17:15]

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.

76543210

ID14

ID13

ID12

ID11

ID10

ID9

ID8

ID7

Reset:

xxxxxxxx

Figure 10-28. Identiﬁer Register 2 (IDR2) — Extended Identiﬁer Mapping

Table 10-27. IDR2 Register Field Descriptions — Extended

Field

Description

7:0

ID[14:7]

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.

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