Renesas RL78 Series

RL78/F13, F14 CHAPTER 17 LIN/UART MODULE (RLIN3)
R01UH0368EJ0210 Rev.2.10 1253
Dec 10, 2015
17.7.2 LIN Slave Mode
Figure 17-42 shows a block diagram of baud rate generation in LIN slave mode.
Figure 17-42. Block Diagram of Baud Rate Generation in LIN Slave Mode
Set the LIN communications clock source as follows.
 LIN communications clock source = f
CLK
Note1
 In the range from 4 MHz to 32 MHz
Note 1. When the timeout error detection is not used, the f
MX clock is selectable as the LIN communication clock source. In
that case, set at least 1.2 times the frequency of the LIN communication clock source to the CPU/peripheral
hardware clock(f
CLK).
In LIN slave mode [Auto Baud Rate], operation is possible with the baud rates from 1 kbps to 20 kbps. Set the prescaler
clock according to the target baud rate so that its frequency is the corresponding value from the list.
[Target baud rate] [Frequency of prescaler clock]
1 kbps to 20 kbps: 4 MHz
Note
1 kbps to less than 2.4 kbps: 4 MHz
2.4 kbps to 20 kbps: 8 MHz to 12 MHz
Note Set the NSPB[3:0] bits in the LWBRn register to 0011b (4 sampling).
Table 17-29 shows the examples of baud rate (19200, 10417, 9600, and 2400 bps) generation for each LIN communication
clock source frequency in LIN slave mode [fixed baud rate] and errors.
Note For the LIN communication clock source, refer to CHAPTER 5 CLOCK GENERATOR.
LIN communication
clock source
Note
Prescaler clock
Baud rate generator
Prescaler
(LPRS[2:0] bits)
16-bit counter
b15 b0
LBRPn1
register
LBRPn0
register
LIN baud rate prescaler
(LBRPn0 and LBRPn1
registers)
Bit sampling
1/4 or 1/8 or 1/16
(NSPB[3:0] bits)
Baud rate
fa
f
LIN
<R>