RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 440 of 765
Mar 7, 2023
(2) Operation procedure
Figure 12-54. Initial Setting Procedure for Slave Reception
Release the serial array unit from the reset state, and
start clock supply to the serial array unit.
Starting initial setting
Setting the PER0 register
Setting the SPSm register
Setting the SMRmn register
Setting the SCRmn register
Setting the SDRmn register
Setting port
Writing to the SSm register
Completing initial setting
Set the operation clock.
Set an operation mode, etc.
Set a communication format.
Set bits 15 to 9 to 0000000B for baud rate setting.
Enable data input and clock input of the target channel by
setting a port register and a port mode register.
Set the SSmn bit of the target channel to 1 (SEmn bit = 1:
to enable operation). Wait for a clock from the master.
Figure 12-55. Procedure for Stopping Slave Reception
Starting setting to stop
Writing the STm register
Changing setting of the SOEm
register
Setting the PER0 regist
Stop setting is completed
If there is any data being transferred
, wait for their
completion. (If there is an urgent must stop
, do not wait
.)
Write 1
to the STmn bit of the target channel
(stopping operation by setting SEmn
= 0).
Set the SOEmn bit to 0 and stop the output of
the target channel.
Stop clock supply to the serial array unit, and reset
the serial array unit.
After the stop setting is completed, go to the next
processing.
(Essential)
TSFmn = 0?
No
Yes
(Selective)
(Essential)
(Selective
)
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