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M16C/5L Group, M16C/56 Group
23.1.25.5 Self-Test Mode 1 (Internal Loop Back)
Self-test mode 1 is provided for self-test functions.
In this mode, the protocol controller treats its transmitted messages as received messages and stores
them into the receive mailbox. To be independent from external stimulation, the protocol controller
generates the ACK bit.
In self-test mode 1, the protocol controller performs an internal feedback from the internal CTX0 pin to
the internal CRX0 pin. The input value of the external CRX0 pin is ignored. The external CTX0 pin
outputs only recessive bits. The CTX0/CRX0 pins do not need to be connected to the CAN bus or any
external device.
Figure 23.33 shows the connection when self-test mode 1 is selected.
Figure 23.33 Connection when Self-Test Mode 1 is Selected
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
CTX0
CRX0
Recessive level
ACK
CTX0
CRX0
internal
internal
23. CAN Module
Page 597 of 803
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