7630 datasheet(113/238 Pages) RENESAS

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7630 Group User’s Manual

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2-47

2.4 Controller Area Network (CAN) module

Fig. 2.4.23 Structure of CAN transmit/receive buffer registers 5 (CTB5/CRB5)

Fig. 2.4.24 Structure of CAN transmit/receive buffer registers 6 to D (CTB6–D/CRB6–D)

CAN transmit/receive buffer registers 5

b7 b6 b5 b4 b3 b2 b1 b0

CAN transmit buffer register 5 (CTB5) [Address: 004516]

CAN receive buffer register 5 (CRB5) [Address: 005516]

Name

Function

At reset

DLC bit 0

The data length code indicates the

number of data bytes in a data frame:

b3b2b1b0

DLC bit 1

0000: Zero data bytes

0001: One data byte

DLC bit 2

0010: Two data bytes

…

DLC bit 3

0111: Seven data bytes

1000: Eight data bytes

r0 bit (reserved bit 0)

For CTB5: Set this bit to “0” (must be

sent dominant).

Not used

When these bits are read out, the value

are "0". Don't write to "1".

CAN transmit/receive buffer registers 6 to D

b7 b6 b5 b4 b3 b2 b1 b0

CAN transmit buffer registers 6 to D (CTB6 to CTBD) [Addresses: 004616 to 004D16]

CAN receive buffer registers 6 to D (CRB6 to CRBD) [Addresses: 005616 to 005D16]

Name

Function

At reset

Data bit 0

For CTBi: These bits represent the byte

number (i – 6) of the data field of a frame

to be transmitted.

For CRBi: These bits represent the byte

number (i – 6) of the data field of a frame

received.

(i = 6 to D16)

Data bit 1

Data bit 2

Data bit 3

Data bit 4

Data bit 5

Data bit 6

Data bit 7

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