Self-Test Mode (Loopback Mode) - Renesas RZ/A Series User Manual

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RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group

Self-Test Mode (Loopback Mode)

In self-test mode, transmitted messages are compared with the receive rule of the own channel and the

messages are stored in a buffer if they have passed through the filter processing. Messages transmitted

from other CAN nodes are compared only with the receive rule for which the GAFLLB bit in the

RSCAN0GAFLIDj register (j = 0 to 15) is set to 0 (when a message transmitted from another CAN

node is received).

If the mirror function and self-test mode are both enabled, the self-test mode setting takes precedence.

21.9.3.1 Self-Test Mode 0 (External Loopback Mode)

Self-test mode 0 is used to perform a loopback test within a channel including the CAN transceiver.

In self-test mode 0, transmitted messages are handled as messages received through the CAN

transceiver and are stored in a buffer. An ACK bit is generated to receive messages transmitted from

the own CAN node.

Figure 21.13 shows the connection when self-test mode 0 is selected.

Figure 21.13

R01UH0437EJ0600 Rev.6.00

Jan 29, 2021

Connection when Self-Test Mode 0 is Selected

CAN transceiver

21. CAN Interface

Rz/a1 series Rz/a1lu series Rz/a1lc series