
RL78/G1P
CHAPTER 11 SERIAL ARRAY UNIT
R01UH0895EJ0100 Rev.1.00
345
Nov 29, 2019
Figure 11-27. 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
Master ready?
(Essential)
Yes
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