Calculating Baud Rate - NEC 78K0R/KE3 User Manual

CHAPTER 11 SERIAL ARRAY UNIT

11.6.5 Calculating baud rate

(1) Baud rate calculation expression
The baud rate for UART (UART0, UART1, 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), mn = 00 to 03, 12, 13
The operation clock (MCK) is determined by serial clock select register m (SPSm) and bit 15 (CKSmn) of serial
mode register mn (SMRmn).
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