MCP2510-SLASHST datasheet(16/80 Pages) MICROCHIP

16 / 80 page

MCP2510

DS21291F-page 16

Only messages that have not already begun to be

transmitted can be aborted. Once a message has

begun transmission, it will not be possible for the user

to reset the TXBnCTRL.TXREQ bit. After transmission

of a message has begun, if an error occurs on the bus

or if the message loses arbitration, the message will be

retransmitted regardless of a request to abort.

FIGURE 3-1:

TRANSMIT MESSAGE FLOWCHART

Start

CAN Bus available

to start transmission

Examine TXBnCTRL.TXP <1:0> to

Are any

TXBnCTRL.TXREQ

bits = 1

The

message

transmission

sequence begins when the

device determines that the

TXBnCTRL.TXREQ for any of

the transmit registers has been

set.

Clear:

TXBnCTRL.ABTF

TXBnCTRL.MLOA

TXBnCTRL.TXERR

Yes

TXBnCTRL.TXREQ=0

CANCTRL.ABAT=1

Clearing the TxBnCTRL.TXREQ

bit while it is set, or setting the

CANCTRL.ABAT bit before the

message has started transmission

will abort the message.

Transmit Message

Was

Message Transmitted

Successfully?

Yes

Set TxBnCTRL.TXREQ=0

CANINTE.TXnIE=1?

Generate

Interrupt

Yes

Set

Did

a message error

occur?

Was

Arbitration lost during

transmission?

Set

TxBnCTRL.TXERR=1

Yes

Determine Highest Priority Message

TxBnCTRL.MLOA=1

The CANINTE.TXnIE bit

determines if an interrupt

should be generated when

a message is successfully

transmitted.

GOTO START

CANTINF.TXnIF=1

Yes

MCP2510-/ST Datenblatt(PDF) 16 Page - Microchip Technology

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