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CP3SP33SMS/NOPB 데이터시트(PDF) 187 Page - Texas Instruments

부품명 CP3SP33SMS/NOPB
상세설명  Connectivity Processor with Cache, DSP, and Bluetooth짰, USB, and Dual CAN Interfaces
PDF  407 Pages
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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CP3SP33SMS/NOPB 데이터시트(HTML) 187 Page - Texas Instruments

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No
No
No
Yes
Ye s
Ye s
Read buffer
Exit
Interrupt Entry Point
Read CNSTAT
Write RX_READY
Read CNSTAT
Clear RX_PND
Read buffer (id/data/control)
RX_READY?
RX_BUSYx?
RX_BUSYx?
RX_FULL or
RX_OVERRUN?
RX_OVERRUN?
(optional, for information)
Yes
No
DS038
CP3SP33
www.ti.com
SNOSCW5 – MAY 2013
Figure 22-21. Buffer Read Routine (BUFFLOCK Disabled)
The first step is only applicable if polling is used to get the status of the receive buffer. It can be deleted
for an interrupt driven receive routine.
1. Read the status (CNSTAT) of the receive buffer. If the status is RX_READY, no was the message
received, so exit. If the status is RX_BUSY, the copy process from hidden receive buffer is not
completed yet, so read CNSTAT again.
If a buffer is configured to RX_READY and its interrupt is enabled, it will assert an interrupt as soon as
the buffer has received a message and entered the RX_FULLstate (see also Section 22.7). In that
case the procedure described below must be followed.
2. Read the status to determine if a new message has overwritten the one originally received which
triggered the interrupt.
3. Write RX_READY into CNSTAT.
4. Read the ID/data and object control (DLC/RTR) from the message buffer.
Copyright © 2013, Texas Instruments Incorporated
Dual CAN Interfaces
187
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