Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0330EJ0200 Rev.2.00 445
Dec 13, 2013
Figure 12-50. Procedure for Resuming Slave Transmission
Starting setting for resumption
Port manipulation
Changing setting of the SPSm register
Changing setting of the SMRmn register
Changing setting of the SOm register
Port manipulation
Writing to the SSm register
Disable data 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
data
(
SOmn
)
.
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 = 1 : to enable operation).
Sets transmit data to the SIOp register (bits
7 to 0 of the SDRmn register) and wait for a
clock from the master.
(Selective)
(Selective)
Changing setting of the SDRmn register
(Selective)
(Selective)
(Essential)
(
Essential
)
(Essential)
(Essential)
Re-set the register to change serial
communication operation setting register
mn (SCRmn) setting.
(Selective)
Changing setting of the SCRmn register
If the OVF flag remain set, clear this
using serial flag clear trigger register mn
(SIRmn).
(Selective)
Clearing error flag
Set the SOEmn bit to 1 and enable
output from the target channel.
(Essential)
Changing setting of the SOEm register
Completing resumption setting
Starting communication
Set the SOEmn bit to 0 to stop output
from the target channel.
(Selective)
Changing setting of the SOEm register
(Essential)
Ye s
No
Wait until stop the communication target
(master)
Completing master
p
re
p
arations?
Remark If PER0 is rewritten while stopping the master transmission and the clock supply is stopped, wait
until the
transmission target (master) stops or transmission finishes, and then perform
initialization instead of restarting the transmission.
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