UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 628

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

15.13.3 Self-test mode
the CAN node to the CAN bus or without affecting the CAN bus.
reception are internally looped back. The CAN transmission pin (CTxD) is fixed to the recessive level.
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 (However, to release the CAN sleep mode in the state that the CAN clock is supplied, it is
necessary to clear the PSMODE0 bit by software after the falling edge on the CAN reception pin (CRxD) is detected).
To keep the module in the CAN sleep mode, use the CAN reception pin (CRxD) as a port pin.
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In the self-test mode, message frame transmission and message frame reception can be tested without connecting
In the self-test mode, the CAN module is completely disconnected from the CAN bus, but transmission and
If the falling edge on the CAN reception pin (CRxD) is detected after the CAN module has entered the CAN sleep
Figure 15-34. CAN Module Terminal Connection in Self-test Mode
Fixed to
the recessive
level
Preliminary User’s Manual U19748EJ1V0UD
CHAPTER 15 CAN CONTROLLER
CTxD
Tx
CAN macro
CRxD
Rx