Datasheet

RL78/L12 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0330EJ0200 Rev.2.00 482
Dec 13, 2013
Figure 12-77. Procedure for Resuming UART Transmission
(Essential)
Yes
No
Wait until stop the communication target
or communication operation completed
Completing master
preparations?
Port manipulation
Changing setting of the SPSm register
Changing setting of the SDRmn register
Changing setting of the SMRmn register
Changing setting of the SOm register
Port manipulation
Writing to the SSm register
Completing resumption setting
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 and set
the SEmn bit to 1 (to enable operation).
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.
(Selective)
(Selective)
(Selective)
Changing setting of the SOEm register
Set the SOEmn bit to 1 and enable
output.
Changing setting of the SOEm register
Clear the SOEmn bit to 0 and stop
output.
(Selective)
Changing setting of the SCRmn register
Re-set the register to change the serial
communication operation setting register
mn (SCRmn) setting.
Changing setting of the SOLm register
Re-set the register to change serial
output level register m (SOLm) setting.
Starting setting for resumption
(Essential)
(Essential)
(Essential)
(Selective)
(Selective)
(Selective)
(Selective)
Remark If PER0 is rewritten while stopping the master transmission and the clock supply is stopped, wait until the
transmission target stops or transmission finishes, and then perform initialization instead of restarting the
transmission.