Renesas rl78 User Manual
RL78/G1A
CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00
532
Jul 04, 2013
(2) Baud rate error during transmission
The baud rate error of UART (UART0 to UART2) 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 f
CLK
= 32 MHz.
f
CLK
= 32 MHz
UART Baud Rate
(Target Baud Rate)
Operation Clock (f
MCK
)
SDRmn[15:9]
Calculated Baud Rate
Error from Target Baud Rate
300 bps
f
CLK
/2
9
103
300.48 bps
+0.16 %
600 bps
f
CLK
/2
8
103
600.96 bps
+0.16 %
1200 bps
f
CLK
/2
7
103
1201.92 bps
+0.16 %
2400 bps
f
CLK
/2
6
103
2403.85 bps
+0.16 %
4800 bps
f
CLK
/2
5
103
4807.69 bps
+0.16 %
9600 bps
f
CLK
/2
4
103
9615.38 bps
+0.16 %
19200 bps
f
CLK
/2
3
103
19230.8 bps
+0.16 %
31250 bps
f
CLK
/2
3
63
31250.0
bps
±0.0 %
38400 bps
f
CLK
/2
2
103
38461.5 bps
+0.16 %
76800 bps
f
CLK
/2
103
76923.1 bps
+0.16 %
153600 bps
f
CLK
103
153846 bps
+0.16 %
312500 bps
f
CLK
50
313725.5 bps
+0.39 %
Remark m: Unit number (m = 0, 1), n: Channel number (n = 0, 2), mn = 00, 02, 10