RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 635
Sep 22, 2011
12.5.8 Calculating transfer clock frequency
The transfer clock frequency for 3-wire serial I/O (CSI00, CSI01, CSI10, CSI11, CSI20, CSI21, CSI30, CSI31)
communication can be calculated by the following expressions.
(1) Master
(Transfer clock frequency) = {Operation clock (fMCK) frequency of target channel} ÷ (SDRmn[15:9] + 1) ÷ 2 [Hz]
(2) Slave
(Transfer clock frequency) = {Frequency of serial clock (SCK) supplied by master}
Note
[Hz]
Note The permissible maximum transfer clock frequency is f
MCK/6.
Remark The value of SDRmn[15:9] is the value of bits 15 to 9 of serial data register mn (SDRmn) (0000000B to
1111111B) and therefore is 0 to 127.
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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