cp3cn23 National Semiconductor Corporation, cp3cn23 Datasheet - Page 115

• Manufacturer Part Number: cp3cn23
• Description: Cp3cn23 Reprogrammable Connectivity Processor With Dual Can Interfaces
• Manufacturer: National Semiconductor Corporation

17.12
Under certain conditions, the CAN module receives a frame
sent by itself, even though the loopback feature is disabled.
Two conditions must be true to cause this malfunction:
T A transmit buffer and at least one receive buffer are con-
T The following sequence of events occurs:
When these conditions occur, the frame sent by the CAN
module will be copied into the next receive buffer available
for the identifier ID_RX_TX.
If a frame with an identifier different to ID_RX_TX is sent or
received in between events 1 and 2, the problem does not
occur.
figured with the same identifier. Assume this identifier is
called ID_RX_TX. With regard to the receive buffer, this
means that the buffer identifier and the corresponding fil-
ter masks are set up in a way that the buffer is able to re-
ceive frames with the identifier ID_RX_TX.
1. A message with the identifier ID_RX_TX from an-
2. A message with the identifier ID_RX_TX is sent by
other CAN node is received into the receive buffer.
the CAN module immediately after the reception
took place.
USAGE HINT
115
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