HC05 datasheet(82/232 Pages) MOTOROLA

82 / 232 page

MOTOROLA

5-20

MC68HC05X16

Rev. 1

MOTOROLA CAN MODULE (MCAN)

5.3.10

Transmit buffer identiﬁer register (TBI)

ID10 – ID3 — Identiﬁer bits

The identiﬁer consists of 11 bits (ID10 – ID0). ID10 is the most signiﬁcant bit and is transmitted ﬁrst

on the bus during the arbitration procedure. The priority of an identiﬁer is deﬁned to be highest for

the smallest binary number. The three least signiﬁcant bits are contained in the TRTDL register.

The seven most signiﬁcant bits must not all be recessive.

5.3.11

Remote transmission request and data length code

ID2 – ID0 — Identiﬁer bits

These bits contain the least signiﬁcant bits of the transmit buffer identiﬁer.

RTR — Remote transmission request

1 (set)

–

A remote frame will be transmitted.

0 (clear) –

A data frame will be transmitted.

DLC3 – DLC0 — Data length code bits.

The data length code contains the number of bytes (data byte count) of the respective message.

At transmission of a remote frame, the data length code is ignored, forcing the number of bytes to

be 0. The data byte count ranges from 0 to 8 for a data frame. Table 5-6 shows the effect of setting

the DLC bits.

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

Transmit buffer identiﬁer (TBI)

$002A

ID10

ID9

ID8

ID7

ID6

ID5

ID4

ID3

Undeﬁned

Address

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

State

on reset

RTR and data length code (TRTDL)

$002B

ID2

ID1

ID0

RTR

DLC3

DLC2

DLC1

DLC0

Undeﬁned

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