Renesas RL78/G1H, User Manual

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RL78/G1H CHAPTER 14 SERIAL ARRAY UNIT
R01UH0575EJ0120 Rev. 1.20 Page 382 of 920
Dec 22, 2016
(2) Operation procedure
Figure 14 - 49 Initial Setting Procedure for Slave Transmission
Figure 14 - 50 Procedure for Stopping Slave 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
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.
Set the initial output level of the serial data
(SOmn).
Set the SOEmn bit to 1 and enable data output of
the target channel.
Enable data output 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).
Initial setting is completed.
Set transmit data to the SIOp register (bits 7 to 0 of
the SDRmn register) and wait for a clock from the
master.
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.
The levels of the 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
Reset the serial array unit by stopping the clock
supply to it.
(Selective)
(Selective)
(Essential)
(Essential)
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
(Selective)