ST ST32M103 Series User Manual

Controller area network (bxCAN) UM0306
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Transmit and receive mailboxes have the same registers except:
● The FMI field in the CAN_RDTxR register.
● A receive mailbox is always write protected.
● A transmit mailbox is write-enabled only while empty, corresponding TME bit in the
CAN_TSR register set.
There are 3 TX Mailboxes and 2 RX Mailboxes. Each RX Mailbox allows access to a 3 level
depth FIFO, the access being offered only to the oldest received message in the FIFO.
Each mailbox consist of 4 registers.
TX mailbox identifier register (CAN_TIxR) (x=0..2)
Address Offsets: 180h, 190h, 1A0h
Reset Value: xXh (except bit 0, TXRQ = 0)
Note: 1 All TX registers are write protected when the mailbox is pending transmission (TMEx reset).
2 This register also implements the TX request control (bit 0) - reset value 0.
CAN_RI0R
CAN_RDT0R
CAN_RL0R
CAN_RH0R
CAN_TI0R
CAN_TDT0R
CAN_TDL0R
CAN_TDH0R
FIFO0
Three Tx Mailboxes
CAN_RI1R
CAN_RDT1R
CAN_RL1R
CAN_RH1R
FIFO1
CAN_TI1R
CAN_TDT1R
CAN_TDL1R
CAN_TDH1R
CAN_TI2R
CAN_TDT2R
CAN_TDL2R
CAN_TDH2R
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
STID[10:0] EXID[17:13]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
EXID[12:0] IDE RTR TXRQ
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:21
STID[10:0]: Standard Identifier
The standard part of the identifier.
Bit 20:3
EXID[17:0:] Extended Identifier
The extended part of the identifier.
Bit 2
IDE: Extended Identifier
This bit defines the identifier type of message in the mailbox.
0: Standard identifier.
1: Extended identifier.
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ST ST32M103 Series Specifications

General

Brand	ST
Model	ST32M103 Series
Category	Microcontrollers
Language	English