ST STM8S

Controller area network (beCAN) RM0016
398/449 Doc ID 14587 Rev 8
CAN mailbox identifier register 1 (CAN_MIDR1)
Address offset: See Table 65. and Table 66.
Reset value: 0xXX
CAN mailbox identifier register 2 (CAN_MIDR2)
Address offset: See Table 65. and Table 66.
Reset value: 0xXX
76543210
Reserved
IDE RTR STID[10:6] / EXID[28:24]
rw rw rw rw rw rw rw
Bit 7 Reserved.
Bit 6 IDE Extended identifier
This bit defines the identifier type of message in the mailbox.
0: Standard identifier.
1: Extended identifier.
Bit 5 RTR Remote transmission request
0: Data frame
1: Remote frame
Bits 4:0 STID[10:6] Standard identifier
5 most significant bits of the standard part of the identifier.
or
EXID[28:24] Extended identifier
5 most significant bits of the “Base” part of extended identifier.
76543210
STID[5:0] / EXID[23:18] EXID[17:16]
rw rw rw rw rw rw rw rw
Bits 7:2 STID[5:0] Standard Identifier
6 least significant bits of the standard part of the identifier.
or
EXID[23:18] Extended Identifier
6 least significant bits of the “Base” part of extended identifier.
Bits 1:0 EXID[17:16] Extended Identifier
2 most significant bits of the “Extended” part of the extended identifier.