RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 477 of 765
Mar 7, 2023
12.6.3 Calculating Baud Rate
(1) Baud rate calculation expression
The baud rate for UART (UART0) communication can be calculated by the following expressions.
(Baud rate) =
{
Operation clock (f
MCK
) frequency of target channel
}
÷
(
SDRmn[15: 9] + 1
)
÷ 2[bps]
Caution Setting serial data register mn (SDRmn) SDRmn[15:9] = (0000000B, 0000001B) is prohibited.
Remark 1. When UART is used, the value of SDRmn[15:9] is the value of bits 15 to 9 of the SDRmn register
(0000010B to 1111111B) and therefore is 2 to 127.
Remark 2. m: Unit number (m = 0), n: Channel number (n = 0), mn = 00
The operation clock (f
MCK
) is determined by serial clock select register m (SPSm) and bit 15 (CKSmn) of serial mode
register mn (SMRmn).
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