Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0330EJ0200 Rev.2.00 480
Dec 13, 2013
(2) Operation procedure
Figure 12-75. Initial Setting Procedure for UART Transmission
Starting initial setting
Setting the PER0 register
Setting the SPSm register
Setting the SMRmn register
Setting the SCRmn register
Setting the SDRmn register
Setting the SOm register
Setting port
Changing setting of the SOEm register
Writing to the SSm register
Completing initial setting
Release the serial array unit from the
reset status and start clock supply.
Set the operation clock.
Set an operation mode, etc.
Set a communication format.
Set a transfer baud rate (setting the
transfer clock by dividing the operation
clock
(
fMCK
))
.
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 SOEmn bit to 1 and enable data
output of the target channel.
Set the SSmn bit of the target channel to 1
and set the SEmn bit to 1 (to enable
o
p
eration
)
.
Initial setting is completed.
Set transmit data to the TXDq register (bits
7 to 0 of the SDRmn register) and start
communication.
Changing setting of the SOLm register
Set an output data level.