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RM0319 데이터시트(PDF) 195 Page - STMicroelectronics

부품명 RM0319
상세설명  SPEAr320S architecture and functionality
PDF  368 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0319 데이터시트(HTML) 195 Page - STMicroelectronics

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RM0319
Controller area network ports (CAN)
Doc ID 022640 Rev 3
195/368
Figure 67.
Data transfer between IFx registers and message RAM
After the partial write of a message object, that Message Buffer registers that are not
selected in the Command Mask register will set to the actual contents of the selected
message object.
After the partial read of a message object, those Message Buffer registers that are not
selected in the Command Mask register will be left unchanged.
Transmission of messages
If the shift register of the CAN core cell is ready for loading and there is no data transfer
between the IFx registers and the message RAM, the MsgVal bits in the Message Valid
register and the TxRqst bits in the Transmission Request register are evaluated. The valid
message object with the highest priority pending transmission request is loaded into the
Shift register by the message handler and the transmission is started. The message object
NewDat bit is reset.
After a successful transmission and if no new data has been written to the message object
(NewDat = ‘0’) since the start of the transmission, the TxRqst bit resets. If TxIE is set, IntPnd
Start
Write Command Request Register
Busy = 1
CAN_WAIT_B = 0
WR/RD = 1
Read Message Object to IFx
Write IFx to Message RAM
Read Message Object to IFx
Busy = 0
CAN_WAIT_B = 1
No
No
Yes
Yes



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