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RL78/G1A 

 

CHAPTER  6   TIMER  ARRAY  UNIT 

R01UH0305EJ0200  Rev.2.00 

 

 

187  

Jul 04, 2013 

Timer array unit is used to check whether signals received in LIN-bus communication match the LIN-bus 

communication format. 

The timer starts counting at the falling edge of a signal input to the serial data input pin (RxD2) of UART2 and the 

count value of the timer is captured at the rising edge.  In this way, a low-level width can be measured.  If the low-

level width is greater than a specific value, it is recognized as a wakeup signal. 

 

The timer starts counting at the falling edge of a signal input to the serial data input pin (RxD2) of UART2 after a 

wakeup signal is detected, and the count value of the timer is captured at the rising edge.  In this way, a low-level 

width is measured.  If the low-level width is greater than a specific value, it is recognized as a break field. 

 

After a break field is detected, the low-level width and high-level width of the signal input to the serial data input pin 

(RxD2) of UART2 are measured.  From the bit interval of the sync field measured in this way, a baud rate is 

calculated. 

 

Remark  For details about setting up the operations used to implement the LIN-bus, see 6.3.13  Input switch control 

register (ISC) and 6.8.5 Operation as input signal high-/low-level width measurement.