参数资料
型号: MCP2515T-E/ML
元件分类: 微控制器/微处理器
英文描述: 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC20
封装: 4 X 4 MM, 0.90 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件页数: 9/88页
文件大小: 1205K
代理商: MCP2515T-E/ML
2010 Microchip Technology Inc.
DS21801F-page 17
MCP2515
FIGURE 3-1:
TRANSMIT MESSAGE FLOWCHART
Start
Is
CAN bus available
to start transmission?
No
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
is
TXBnCTRL.TXREQ=0
or CANCTRL.ABAT=1
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.
No
Transmit Message
Was
Message Transmitted
Successfully?
No
Yes
Clear TxBnCTRL.TXREQ
CANINTE.TXnIE=1?
Generate
Interrupt
Yes
Message
Yes
Set
TxBnCTRL.TXERR
Lost
Determine Highest Priority Message
No
?
Set
TxBNCTRL.MLOA
The CANINTE.TXnIE bit
determines if an interrupt
should be generated when
a message is successfully
transmitted.
GOTO START
CANTINF.TXnIF
Yes
No
Message error
or
Lost arbitration
Arbitration
Error
CANINTE.MEERE?
No
Generate
Interrupt
Yes
Set
CANTINF.MERRF
?
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