MCP2515-E/PRB2 Microchip Technology, MCP2515-E/PRB2 Datasheet - Page 17

• Manufacturer Part Number: MCP2515-E/PRB2
• Description: CAN controller with SPI interface, 125 deg C, -40C to +125C, 18-PDIP, TUBE
• Manufacturer: Microchip Technology

FIGURE 3-1:
© 2007 Microchip Technology Inc.
The CANINTE.TXnIE bit
determines if an interrupt
should be generated when
a message is successfully
transmitted.
Generate
Interrupt
TRANSMIT MESSAGE FLOWCHART
Determine Highest Priority Message
Examine TXBnCTRL.TXP <1:0> to
No
Yes
Clear TxBnCTRL.TXREQ
Message Transmitted
to start transmission?
TXBnCTRL.TXREQ
CANINTE.TXnIE=1?
Clear:
TXBnCTRL.ABTF
TXBnCTRL.MLOA
TXBnCTRL.TXERR
CAN bus available
Transmit Message
CANTINF.TXnIF
GOTO START
Successfully?
Yes
Are any
bits = 1
Start
Was
Set
Is
?
Yes
No
Yes
No
No
The message transmission
sequence begins when the
device determines that the
TXBnCTRL.TXREQ for any of
the transmit registers has been
set.
Lost
Arbitration
TxB
Lost arbitration
Message error
N
TXBnCTRL.TXREQ=0
or CANCTRL.ABAT=1
CTRL.MLOA
Set
or
?
Clearing the TxBnCTRL.TXREQ bit
while it is set, or setting the CAN-
CTRL.ABAT bit before the message
has started transmission, will abort
the message.
is
?
Yes
Message
Error
CANINTE.MEERE?
TxBnCTRL.TXERR
CANTINF.MERRF
No
No
Set
Set
MCP2515
DS21801E-page 17
Generate
Yes
Interrupt