7630 datasheet(127/238 Pages) RENESAS

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7630 Group User’s Manual

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2-61

2.4 Controller Area Network (CAN) module

Fig. 2.4.36 Transmit buffer organization

Altogether the following items of the transmit buffer need to be initialized:

• IDE bit CBT1.0: this bit represents the identifier extension (IDE) bit of a frame.

• RTR/SRR bit CBT1.1: for standard format frames, this bit represents the

remote transmission request

(RTR) bit of the arbitration field; for extended format frames it represents the

substitute remote request

(SRR) bit of the arbitration field.

• RTR bit CBT4.1: this bit represents the

remote transmission request (RTR) bit of the arbitration field of an

extended format frame; not relevant for standard format frames.

• Reserved bit r0 CBT5.4: this bit represents the reserved bit r0 of the control field of a standard or extended

format frame; should be set to “0”/sent dominant (refer to the CAN specification).

• Reserved bit r1 CBT4.0: this bit represents the reserved bit r0 of the control field of an extended format

frame; not relevant for standard format frames; should be set to “0”/sent dominant (refer to the CAN speci-

fication).

• Identifier bits of CBT0 to CBT4: these bits represent the identifier of the arbitration field of a frame; CBT2 to

CBT4 hold the extended identifier bits and are not relevant for standard format frames.

• DLC bits of CBT5: these bits represent the data length code of the data field of a data frame; not relevant

for remote frames.

• Data bits of CBT6 to CBTD: these bits represent the data field of a data frame; not relevant for remote

frames.

For settings of the IDE-, RTR/SRR-, RTR-, r0- and r1 bits to be programmed refer to the table below:

(3) Lock the transmit buffer

Once the transmit buffer is initialized, the transmit buffer control bit of CTRM (Figure 2.4.3) should be set to

“1”. This locks the transmit buffer thereby protects it from being altered accidentally. After locking, data read

from the address range of the transmit buffer is undefined. The buffer remains locked until either the trans-

Frame format

Frame type

IDE

RTR/SRR

RTR

standard format

(11-bit identifier)

data frame

remote frame

extended format

(29-bit identifer)

data frame

remote frame

Offset

SID10

SID9

SID8

SID7

SID6

SID5

SID4

SID3

SID2

SID1

SID0

RTR/SRR

IDE

EID17

EID16

EID15

EID14

EID13

EID12

EID11

EID10

EID9

EID8

EID7

EID6

EID5

EID4

EID3

EID2

EID1

EID0

RTR

004016

004116

004216

004316

004416

DLC3

DLC2

DLC1

DLC0

004516

004616

Data byte 0

004716

Data byte 1

004816

Data byte 2

004916

Data byte 3

004A16

Data byte 4

004B16

Data byte 5

004C16

Data byte 6

004D16

Data byte 7

Name

CTB0

CTB1

CTB2

CTB3

CTB4

CTB5

CTB6

CTB7

CTB8

CTB9

CTBA

CTBB

CTBC

CTBD

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