Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  12   SERIAL  ARRAY  UNIT 

R01UH0305EJ0200  Rev.2.00 

 

 

442  

Jul 04, 2013 

 

Starting setting for resumption

Port manipulation 

Changing setting of the SPSm register

Changing setting of the SMRmn register

Writing to the SSm register

Completing resumption 

Disable data output and clock 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 

clock (CKOmn) and serial data (SOmn). 

Enable data output and clock 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 

(SEmn = 1: to enable operation). 

Setting is completed

Sets transmit data to the SIOp register (bits 

7 to 0 of the SDRmn register) and start 

communication.

 

(Essential) 

(Selective) 

(Selective) 

(Selective) 

(Selective) 

(Essential) 

(Essential) 

Re-set the register to change serial 

communication operation setting register 

mn (SCRmn) setting. 

(Selective) 

Changing setting of the SCRmn register

Set the SOEmn bit to 1 and enable output 

from the target channel. 

(Selective) 

Changing setting of the SOEm register

Set the SOEmn bit to 0 to stop output 

from the target channel. 

(Selective) 

Changing setting of the SOEm register

Master ready?

(Essential) 

Yes 

No 

Wait until stop the communication target 

(slave) or communication operation 

completed 

Changing setting of the SDRmn register

Port manipulation 

Changing setting of the SOm register

 

 

Remarks 1.  If PER0 is rewritten while stopping the master transmission and the clock supply is stopped, wait 

until the transmission target (slave) stops or transmission finishes, and then perform initialization 

instead of restarting the transmission. 

m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), p: CSI number (p = 00, 01, 10, 11, 20, 

21), mn = 00 to 03, 10, 11