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RL78/F13, F14 CHAPTER 17 LIN/UART MODULE (RLIN3)

R01UH0368EJ0210 Rev.2.10 1244

Dec 10, 2015

17.6 LIN Self-Test Mode

The LIN/UART module has a LIN self-test mode. When LIN self-testing is turned on, the LTXDn and LRXDn signals are

disconnected from the external pins and connected within the LIN/UART module. Frames transferred from the internal

LTXDn terminal loop back to the internal LRXDn terminal. The LIN self-test mode is exclusively for testing LIN mode

operation.

The following four types of tests are available:

 LIN master self-test mode (transmission): header transmission and response transmission

 LIN master self-test mode (reception): header transmission and response reception

 LIN slave self-test mode (transmission): header reception and response transmission

 LIN slave self-test mode (reception): header reception and response reception

In the LIN self-test mode, the LIN/UART module operates at the highest baud rate regardless of the setting of the baud

rate generator. The baud rate is <frequency of the LIN communications clock source>/16 bps regardless of the settings of

the baud rate related registers (the NSPB bit in the LWBRn register must be set to 0000b or 1111b).

In the LIN self-test mode, the following functions are not supported. Do not use these functions.

 LIN wake-up mode

 Frame separate mode

 Multi-byte response reception and transmission

 LIN slave mode [auto baud rate]

 Frame/response timeout error

Figure 17-39. Connection in LIN Reset Mode, LIN Mode and UART Mode

Figure 17-40. Connection in LIN Self-Test Mode

LTXDn pin

LRXDn pin

Internal LTXDn

Internal LRXDn

LIN controller

Input to or output from LIN transceiver