Specifications

Message Objects
10-11 CAN Controller Module
Bit 13 AAM. Auto Answer Mode Bit
0 Transmit
mailbox
The mailbox does not reply to remote requests
automatically. If a matching identifier is received, it is
not stored.
Receive
mailbox
No influence on a receive mailbox.
1 Transmit
mailbox
If a matching remote request is received, the CAN
Peripheral answers by sending the contents of the
mailbox.
Receive
mailbox
No influence on a receive mailbox.
This bit is only used for mailboxes 2 and 3.
Bits 12–0 IDH[28:16]. Upper 13 Bits of extended identifier. For a standard identifier, the
11-bit identifier will be stored in bits 12 to 2 of the MSGID’s upper word.
Figure 10–6. Message Identifier for Low Word Mailboxes 0–5 (MSGIDnL)
15–0
IDL[15:0]
RW
Note: R = Read access; W = Write access
Bits 15–0 IDL[15:0]. The lower part of the extended identifier is stored in these bits.
3) Message Control Field:
Each one of the six mailboxes has its own “Message Control Field”.
Figure 10–7 illustrates the layout and default mode of the message control
field.
Figure 10–7. Message Control Field (MSGCTRLn)
15–5 4 3–0
Reserved RTR DLC[3:0]
RW RW
Note: R = Read access; W = Write access
Bits 15–5 Reserved.
Bit 4 RTR. Remote Transmission Request bit
0 Data frame
1 Remote frame