Test Function; Standard Test Mode; Listen-Only Mode - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group
21.9

Test Function

The test function is classified into communication tests and global tests.
•
Communication tests: Performed for each channel.

– Standard test mode

– Listen-only mode

– Self-test mode 0 (external loopback mode)
– Self-test mode 1 (internal loopback mode)
• Global tests: Performed for the entire module
– Inter-channel communication test
21.9.1 Standard Test Mode
Standard test mode allows CRC test.
21.9.2 Listen-Only Mode
Listen-only mode allows reception of data frames and remote frames. Only recessive bits are
transmitted on the CAN bus, and the ACK bit, overload flag, and active error flag are not transmitted.
Listen-only mode is available for detecting the communication speed.
Do not make a transmit request from any buffer or queue in listen-only mode.
Figure 21.12 shows the connection when listen-only mode is selected.
Figure 21.12
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
m = 0 or 1
Transmits the ACK bit, overload flag,
and active error flag.
Connection when Listen-Only Mode is Selected
CANmTX CANmRX
Recessive level
CANmTX CANmRX
(internal) (internal)
21. CAN Interface
21-138