RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 358 of 920
Dec 22, 2016
(2) Operation procedure
Figure 14 - 25 Initial Setting Procedure for Master Transmission
Figure 14 - 26 Procedure for Stopping Master Transmission
Release the serial array unit from the reset status
and start clock supply.
Setting the PER0 register
Starting initial setting
Setting the SPSm register
Setting the SMRmn register
Setting the SCRmn register
Setting the SDRmn register
Setting the SOm register
Changing setting of the
SOEm register
Set the operation clock.
Set an operation mode, etc.
Set a communication format.
Set a transfer baud rate (setting the transfer clock
by dividing the operation clock (f
MCK)).
Set the initial output level of the serial clock
(CKOmn) and serial data (SOmn).
Set the SOEmn bit to 1 and enable data output of
the target channel.
Setting port
Writing to the SSm register
Completing initial setting
Setting a port register and a port mode register
(Enable data output and clock output of the target channel by ).
Set the SSmn bit of the target channel to 1
(SEmn bit = 1: to enable operation).
Setting of SAU is completed.
Write transmit data to the SIOp register (bits 7 to 0
of the SDRmn register) and start communication.
Write 1 to the STmn bit of the target channel .
(SEmn = 0: to operation stop status)
Writing the STm register
Starting setting to stop
Changing setting of the
SOEm register
Stop setting is completed
Set the SOEmn bit to 0 and stop the output of the
target channel.
After the stop setting is completed, go to the next
processing.
TSFmn = 0?
No
If there is any data being transferred, wait for their completion
(If there is an urgent must stop, do not wait).
Yes
The levels of the serial clock (CKOmn) and
serial data (SOmn) on the target channel can
be changed if necessitated by an emergency .
Changing setting of the
SOm register
Setting the PER0 register
To use the STOP mode, reset the serial array
unit by stopping the clock supply to it.
(Selective)
(Selective)
(Selective)
(Essential)
(Essential)
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