UPD78F1502AGK-GAK-AX Datasheet, PDF (566/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
(2) Baud rate error during transmission
The baud rate error of UART (UART0, UART1, UART2, UART3) 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 = 20 MHz.
UART Baud Rate
(Target Baud Rate)
300 bps
600 bps
1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
31250 bps
38400 bps
76800 bps
153600 bps
312500 bps
Operation Clock (MCK)
fCLK/2⁹
fCLK/2⁸
fCLK/2⁷
fCLK/2⁶
fCLK/2⁵
fCLK/2⁴
fCLK/2³
fCLK/2³
fCLK/2²
fCLK/2
fCLK
fCLK
fCLK = 20 MHz
SDRmn[15:9] Calculated Baud Rate
64
300.48 bps
64
600.96 bps
64
1201.92 bps
64
2403.85 bps
64
4807.69 bps
64
9615.38 bps
64
19230.8 bps
39
31250.0 bps
64
38461.5 bps
64
76923.1 bps
64
153846 bps
31
312500 bps
Error from Target Baud Rate
+0.16 %
+0.16 %
+0.16 %
+0.16 %
+0.16 %
+0.16 %
+0.16 %
±0.0 %
+0.16 %
+0.16 %
+0.16 %
±0.0 %
R01UH0004EJ0501 Rev.5.01
550
Jun 20, 2011