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RL78/D1A User's Manual: Hardware - Renesas

RL78/D1A User's Manual: Hardware - Renesas

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Under development<br />

Preliminary document<br />

Specifications in this document are tentative and subject to change.<br />

<strong>RL78</strong>/<strong>D1A</strong> CHAPTER 6 TIMER ARRAY UNIT<br />

6.1.3 LIN-bus supporting function (Channel 3 of the timer array unit 0, channels 1 and 4 of the timer array unit 1,<br />

and channel 0 of the timer array unit 2 only)<br />

(1) Detection of wakeup signal<br />

The timer starts counting at the falling edge of a signal input to the serial data input pin (LRxD0, LRxD1) of LIN-<br />

UART 0, 1 and the count value of the timer is captured at the rising edge. In this way, a low-level width can be<br />

measured. If the low-level width is greater than a specific value, it is recognized as a wakeup signal.<br />

(2) Measurement of pulse width of sync field<br />

After a sync break field is detected, the low-level width and high-level width of the signal input to the serial data<br />

input pin (LRxD0, LRxD1) of LIN-UART0, 1 are measured. From the bit interval of the sync field measured in this<br />

way, a baud rate is calculated.<br />

R01UH0317EJ0004 Rev. 0.04 317<br />

Feb. 22, 2013

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