Message Mailbox
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SPRUI07–March 2020
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Controller Area Network (CAN)
Table 13-5. Addresses of LAM, MOTS, and MOTO Registers for Mailboxes (eCAN-B)
Mailbox LAM MOTS MOT0
0 6240h−6241h 6280h−6281h 62C0h−62C1h
1 6242h− 6243h 6282h−6283h 62C2h−62C3h
2 6244h− 6245h 6284h−6285h 62C4h−62C5h
3 6246h−6247h 6286h−6287h 62C6h−62C7h
4 6248h−6249h 6288h−6289h 62C8h−62C9h
5 624Ah−624Bh 628Ah−628Bh 62CAh−62CBh
6 624Ch−624Dh 628Ch−628Dh 62CCh−62CDh
7 624Eh−624Fh 628Eh−628Fh 62CEh−62CFh
8 6250h−6251h 6290h−6291h 62D0h−62D1h
9 6252h−6253h 6292h−6293h 62D2h−62D3h
10 6254h−6255h 6294h−6295h 62D4h−62D5h
11 6256h−6257h 6296h−6297h 62D6h−62D7h
12 6258h−6259h 6298h−6299h 62D8h−62D9h
13 625Ah−625Bh 629Ah−629Bh 62DAh−62DBh
14 625Ch−625Dh 629Ch−629Dh 62DCh−62DDh
15 625Eh−625Fh 629Eh−629Fh 62DEh−62DFh
16 6260h−6261h 62A0h−62A1h 62E0h−62E1h
17 6262h−6263h 62A2h−62A3h 62E2h−62E3h
18 6264h−6265h 62A4h−62A5h 62E4h−62E5h
19 6266h−6267h 62A6h−62A7h 62E6h−62E7h
20 6268h−6269h 62A8h−62A9h 62E8h−62E9h
21 626Ah−626Bh 62AAh−62ABh 62EAh−62EBh
22 626Ch−626Dh 62ACh−62ADh 62ECh−62EDh
23 626Eh−626Fh 62AEh−62AFh 62EEh−62EFh
24 6270h−6271h 62B0h−62B1h 62F0h−62F1h
25 6272h−6273h 62B2h−62B3h 62F2h−62F3h
26 6274h−6275h 62B4h−62B5h 62F4h−62F5h
27 6276h−6277h 62B6h−62B7h 62F6h−62F7h
28 6278h−6279h 62B8h−62B9h 62F8h−62F9h
29 627Ah−627Bh 62BAh−62BBh 62FAh−62FBh
30 627Ch−627Dh 62BCh−62BDh 62FCh−62FDh
31 627Eh−627Fh 62BEh−62BFh 62FEh−62FFh
13.6.1 Transmit Mailbox
The CPU stores the data to be transmitted in a mailbox configured as transmit mailbox. After writing the
data and the identifier into the RAM, the message is sent if the corresponding TRS[n] bit has been set,
provided the mailbox is enabled by setting the corresponding the CANME.n bit.
If more than one mailbox is configured as transmit mailbox and more than one corresponding TRS[n] is
set, the messages are sent one after another in falling order beginning with the mailbox with the highest
priority.
In the SCC-compatibility mode, the priority of the mailbox transmission depends on the mailbox number.
The highest mailbox number (=15) comprises the highest transmit priority.
In the eCAN mode, the priority of the mailbox transmission depends on the setting of the TPL field in the
message control field (MSGCTRL) register. The mailbox with the highest value in the TPL is transmitted
first. Only when two mailboxes have the same value in the TPL is the higher numbered mailbox
transmitted first.
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