Self-Test Mode - NEC V850E/RS1 User Manual

16.13.3 Self-test mode

In the self-test mode, message frame transmission and message frame reception can be tested without
connecting the CAN node to the CAN bus or without affecting the CAN bus.
In the self-test mode, the CAN module is completely disconnected from the CAN bus, but transmission
and reception are internally looped back. The CAN transmission pin (CTXDn) is fixed to the recessive
level.
If the falling edge on the CAN reception pin (CRXDn) is detected after the CAN module has entered the
CAN sleep mode from the self-test mode, however, the module is released from the CAN sleep mode in
the same manner as the other operation modes. To keep the module in the CAN sleep mode, use the
CAN reception pin (CRXDn) as a port pin.
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Chapter 16 FCAN Controller
Figure 16-55: CAN Module Terminal Connection in Self-Test Mode
Fixed to
the recessive
level
CTXDn
User's Manual U16702EE3V2UD00
CAN macro
Tx
Rx
CRXDn