263
7679H–CAN–08/08
AT90CAN32/64/128
– 00 - disable.
– 01 - enable transmission.
– 10 - enable reception.
– 11 - enable frame buffer reception
These bits are not cleared once the communication is performed. The user must re-write the
configuration to enable a new communication.
• This operation is necessary to be able to reset the BXOK flag.
• This operation also set the corresponding bit in the CANEN registers.
• Bit 5 – RPLV: Reply Valid
Used in the automatic reply mode after receiving a remote frame.
– 0 - reply not ready.
– 1 - reply ready and valid.
• Bit 4 – IDE: Identifier Extension
IDE bit of the remote or data frame to send.
This bit is updated with the corresponding value of the remote or data frame received.
– 0 - CAN standard rev 2.0 A (identifiers length = 11 bits).
– 1 - CAN standard rev 2.0 B (identifiers length = 29 bits).
• Bit 3:0 – DLC3:0: Data Length Code
Number of Bytes in the data field of the message.
DLC field of the remote or data frame to send. The range of DLC is from 0 up to 8. If DLC field >8
then effective DLC=8.
This field is updated with the corresponding value of the remote or data frame received. If the
expected DLC differs from the incoming DLC, a DLC warning appears in the CANSTMOB
register.
19.11.3 CAN Identifier Tag Registers -
CANIDT1, CANIDT2, CANIDT3, and CANIDT4
V2.0 part A
V2.0 part B
Bit 15/7 14/6 13/5 12/4 11/3 10/2 9/1 8/0
- - - - - RTRTAG - RB0TAG CANIDT4
--------CANIDT3
IDT
2
IDT
1
IDT
0-----CANIDT2
IDT
10
IDT
9
IDT
8
IDT
7
IDT
6
IDT
5
IDT
4
IDT
3 CANIDT1
Bit 31/23 30/22 29/21 28/20 27/19 26/18 25/17 24/16
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value--------
Bit 15/7 14/6 13/5 12/4 11/3 10/2 9/1 8/0
IDT
4
IDT
3
IDT
2
IDT
1
IDT
0 RTRTAG RB1TAG RB0TAG CANIDT4
IDT
12
IDT
11
IDT
10
IDT
9
IDT
8
IDT
7
IDT
6
IDT
5 CANIDT3
IDT
20
IDT
19
IDT
18
IDT
17
IDT
16
IDT
15
IDT
14
IDT
13 CANIDT2
IDT
28
IDT
27
IDT
26
IDT
25
IDT
24
IDT
23
IDT
22
IDT
21 CANIDT1
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