RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 696
Sep 22, 2011
12.8.5 Calculating transfer rate
The transfer rate for simplified I
2
C (IIC00, IIC01, IIC10, IIC11, IIC20, IIC21, IIC30, IIC31) communication can be
calculated by the following expressions.
(Transfer rate) = {Operation clock (f
MCK) frequency of target channel} ÷ (SDRmn[15:9] + 1) ÷ 2
Caution Setting SDRmn[15:9] = 0000000B is prohibited. Setting SDRmn[15:9] = 0000001B or more.
Remarks 1. The value of SDRmn[15:9] is the value of bits 15 to 9 of the SDRmn register (0000001B to
1111111B) and therefore is 1 to 127.
2. m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), mn = 00 to 03, 10 to 13
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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