Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0330EJ0200 Rev.2.00 416
Dec 13, 2013
Figure 12-26. Procedure for Resuming Master Transmission
Remark If PER0 is rewritten while stopping the master transmission and the clock supply is stopped, wait
until the transmission target (slave) stops or transmission finishes, and then perform initialization
instead of restarting the transmission.
Starting setting for resumption
Port manipulation
Changing setting of the SPSm register
Changing setting of the SMRmn register
Writing to the SSm register
Completing resumption
setting
Disable data output and clock output of
the target channel by setting a port
register and a port mode register.
Re-set the register to change the operation
clock setting.
Re-set the register to change the
transfer baud rate setting (setting the
transfer clock by dividing the operation
clock (f
MCK)).
Re-set the register to change serial
mode register mn (SMRmn) setting.
Set the initial output level of the serial
clock (CKOmn) and serial data (SOmn).
Enable data output and clock 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 = 1 : to enable operation).
Setting is completed
Sets transmit data to the SIOp register (bits
7 to 0 of the SDRmn register) and start
communication.
(Essential)
(Selective)
(Selective)
(Selective)
(Selective)
(
Essential
)
(Essential)
Re-set the register to change serial
communication operation setting register
mn (SCRmn) setting.
(
Selective
)
Changing setting of the SCRmn register
Set the SOEmn bit to 1 and enable
output from the target channel.
(Selective)
Changing setting of the SOEm register
Set the SOEmn bit to 0 to stop output
from the target channel.
(Selective)
Changing setting of the SOEm register
Slave ready?
(Essential)
Ye s
No
Wait until stop the communication target
(slave) or communication operation
completed
Changing setting of the SDRmn register
Port manipulation
Changing setting of the SOm register
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