Renesas RL78/G1P Hardware User Manual page 441

RL78/G1P
(2) Operation procedure
Figure 11-92. Initial Setting Procedure for Slave Transmission/Reception
Setting the PER0 register
Setting the SPSm register
Setting the SMRmn register
Setting the SCRmn register
Setting the SDRmn register
Changing setting of the SOEm register
Writing to the ISC register
Writing to the SSm register
Caution Be sure to set transmit data to the SlOp register before the clock from the master is started.
Remark m: Unit number (m = 0), n: Channel number (n = 0), p: CSI number (p = 00)
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
Starting initial setting
Setting the SOm register
Setting port
Starting communication
CHAPTER 11 SERIAL ARRAY UNIT
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 bits 15 to 9 to 0000000B for baud
rate setting.
Set the initial output level of the serial
data (SOmn).
Set the SOEmn bit to 1 and enable data
output of the target channel.
Enable data output of the target channel
by setting a port register and a port
mode register. When connecting
multiple slaves, set N-ch open-drain
before setting data output.
Set the SSIE00 bit to 1 and enable slave
select function operation of channel 0.
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 SIOp register (bits 7 to 0
of the SDRmn register) and wait for a clock from
the master.
422