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CHAPTER 14 SERIAL ARRAY UNIT
Page 402 of 920
14.5.7
Calculating transfer clock frequency
The transfer clock frequency for 3-wire serial I/O (CSIp) communication can be calculated by the following
expressions.
(1) Master
(2) Slave
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).
(Transfer clock frequency) = {Operation clock (f
MCK
) frequency of target channel} ÷ (SDRmn[15:9] + 1) ÷ 2 [Hz]
(Transfer clock frequency) = {Frequency of serial clock (SCK) supplied by master}
[Hz]
Содержание RL78/G1H
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