RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 979
Dec 10, 2015
(2) Baud rate error during transmission
The baud rate error of UART (UART0, UART1) communication during transmission can be calculated by the following
expression. Make sure that the baud rate at the transmission side is within the permissible baud rate range at the
reception side.
(Baud rate error) = (Calculated baud rate value) ÷ (Target baud rate) × 100 − 100 [%]
Here is an example of setting a UART baud rate at fCLK = 32 MHz.
UART Baud Rate
(Target Baud Rate)
fCLK = 32 MHz
Operation Clock (fMCK) SDRmn[15:9] Calculated Baud Rate Error from Target Baud Rate
300 bps fCLK/2
9
103 300.48 bps +0.16 %
600 bps fCLK/2
8
103 600.96 bps +0.16 %
1200 bps fCLK/2
7
103 1201.92 bps +0.16 %
2400 bps fCLK/2
6
103 2403.85 bps +0.16 %
4800 bps fCLK/2
5
103 4807.69 bps +0.16 %
9600 bps fCLK/2
4
103 9615.38 bps +0.16 %
19200 bps fCLK/2
3
103 19230.8 bps +0.16 %
31250 bps fCLK/2
3
63 31250.0 bps ±0.0 %
38400 bps fCLK/2
2
103 38461.5 bps +0.16 %
76800 bps fCLK/2 103 76923.1 bps +0.16 %
153600 bps fCLK 103 153846 bps +0.16 %
312500 bps fCLK 50 313725.5 bps +0.39 %
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0), mn = 00, 10
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