RL78/G1P
CHAPTER 11 SERIAL ARRAY UNIT
R01UH0895EJ0100 Rev.1.00
437
Nov 29, 2019
(2) Operation procedure
Figure 11-101. 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 (f
MCK
)).
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
operation).
Initial setting is completed.
Set transmit data to the SDRmn [7:0] bits
(TXDq register) (8 bits) or the SDRmn [8:0]
bits (9 bits) and start communication.
Changing setting of the SOLm register
Set an output data level.