ST STM32F446 Series User Manual

RM0390 Rev 4 1063/1328
RM0390 Controller area network (bxCAN)
1076
Figure 399. CAN mailbox registers
CAN TX mailbox identifier register (CAN_TIxR) (x = 0..2)
Address offsets: 0x180, 0x190, 0x1A0
Reset value: 0xXXXX XXXX (except bit 0, TXRQ = 0)
All TX registers are write protected when the mailbox is pending transmission (TMEx reset).
This register also implements the TX request control (bit 0) - reset value 0.
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31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
STID[10:0]/EXID[28:18] EXID[17:13]
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EXID[12:0] IDE RTR TXRQ
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Bits 31:21 STID[10:0]/EXID[28:18]: Standard identifier or extended identifier
The standard identifier or the MSBs of the extended identifier (depending on the IDE bit
value).
Bit 20:3 EXID[17:0]: Extended identifier
The LSBs of the extended identifier.
Bit 2 IDE
: Identifier extension
This bit defines the identifier type of message in the mailbox.
0: Standard identifier.
1: Extended identifier.
Bit 1 RTR
: Remote transmission request
0: Data frame
1: Remote frame
Bit 0 TXRQ
: Transmit mailbox request
Set by software to request the transmission for the corresponding mailbox.
Cleared by hardware when the mailbox becomes empty.

ST STM32F446 Series Specifications

General

Brand	ST
Model	STM32F446 Series
Category	Microcontrollers
Language	English