UPD78F1502AGK-GAK-AX Datasheet, PDF (564/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
14.6.5 Calculating baud rate
(1) Baud rate calculation expression
The baud rate for UART (UART0, UART1, UART2, UART3) communication can be calculated by the following
expressions.
(Baud rate) = {Operation clock (MCK) frequency of target channel} ÷ (SDRmn[15:9] + 1) ÷ 2 [bps]
Caution Setting SDRmn [15:9] = (0000000B, 0000001B) is prohibited.
Remarks 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.
2. m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3)
The operation clock (MCK) is determined by serial clock select register m (SPSm) and bit 15 (CKSmn) of serial
mode register mn (SMRmn).
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011