RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 599
Sep 22, 2011
(2) Operation procedure
Figure 12-43. Initial Setting Procedure for Master Transmission/Reception
Figure 12-44. Procedure for Stopping Master Transmission/Reception
Remark Even after communication is stopped, the pin level is retained. To resume the operation, re-set serial
output register m (SOm) (see Figure 12-45 Procedure for Resuming Master Transmission).
Set an operation mode, etc.
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
Changing setting of the SOEm register
Setting port
Writing to the SSm register
Starting communication
Release the serial array unit from the
reset status and start clock supply.
Set the operation clock.
Set a communication format.
Set the initial output level of the serial
clock (CKOmn) and serial data (SOmn).
Set the SOEmn bit to 1 and enable data
output of the target channel.
Enable data output and clock output of
the target channel by setting a port
register and a port mode register.
Set transmit data to the SIOp register (bits
7 to 0 of the SDRmn register) and start
communication.
Set the SSmn bit of the target channel to 1
and set the SEmn bit to 1 (to enable
Set a transfer baud rate (setting the
transfer clock by dividing the operation
clock (f
MCK)).
Starting setting to stop
Stopping communication
Write 1 to the STmn bit of the target
channel.
Stop communication in midway.
Changing setting of the SOEm register
Set the SOEmn bit to 0 and stop the
output of the target channel.
Setting the STm register
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