Self-Test Mode - NEC V850ES/F 3-L Series User Manual

Chapter 18
Caution

18.13.3 Self-test mode

Figure 18-33
626
The single-shot mode can be used when emulating time-triggered
communication methods (e.g., TTCAN level 1).
The AL bit is only valid in single-shot mode. It does not influence the operation
of re-transmission upon arbitration loss in the other operation modes.
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.
CAN module terminal connection in self-test mode
User's Manual U18743EE1V2UM00
CAN macro
Tx
Rx
Fixed to
the recessive
level
CTXDn
CRXDn
CAN Controller (CAN)