RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 422 of 920
Dec 22, 2016
14.6.3 Calculating baud rate
(1) Baud rate calculation expression
The baud rate for UART (UARTq) communication can be calculated by the following expressions.
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, 1), n: Channel number (n = 2, 3), mn = 02, 03, 12, 13, q: UART number (q =
1, 3)
The operation clock (f
MCK) is determined by serial clock select register m (SPSm) and bit 15 (CKSmn) of serial
mode register mn (SMRmn).
(Baud rate) = {Operation clock (f
MCK) frequency of target channel} ÷ (SDRmn[15:9] + 1) ÷ 2 [bps]
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