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Renesas rl78 User Manual

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RL78/G1A 
 
CHAPTER  12   SERIAL  ARRAY  UNIT 
R01UH0305EJ0200  Rev.2.00 
 
 
466  
Jul 04, 2013 
Figure 12-47.  Flowchart of Master Transmission/Reception (in Continuous Transmission/Reception Mode) 
 
Setting 
transmission/reception data
Reading reception data from
SIOp (=SDRmn[7:0]) 
Write 1 to STmn bit 
For the initial setting, see Figure 12-42.  
(Select buffer empty interrupt)
 
 
SAU default setting 
No
No
End of communication
Yes 
Yes
No
Continuing Communication?
Yes 
Number of 
communication data?
Write 1 to MDmn0 bit   
BFFmn = 1? 
<2> 
<3> 
<5>
<6> 
<7> 
<4> 
<8> 
<1> 
Subtract -1 from number of 
transmit data 
Setting storage data and number of data for transmission/reception data 
(Storage area, Transmission data pointer, Reception data, Number of 
communication data and Communication end flag are optionally set on the 
internal RAM by the software)
 
Clear MDmn0 bit to 0
Writing dummy data to 
SIOp (=SDRmn[7:0]) 
Writing transmit data to 
SIOp (=SDRmn[7:0]) 
Except for initial interrupt, read data received then write them 
to storage area, and update receive data pointer 
If transmit data is left (number of communication data is 
equal or grater than 2), read them from storage area then 
write into SIOp, and update transmit data pointer. 
If it’s waiting for the last data to receive (number of 
communication data is equal to 1), change interrupt timing 
to communication end 
RETI 
Number of communication 
data = 0? 
Starting setting 
When transmission/reception interrupt is generated, it
moves to interrupt processing routine
 
 
Buffer empty/transfer end interrupt
Wait for transmission/reception 
completes 
≥ 2 
= 0 
= 1 
Enables interrupt 
Clear interrupt request flag (XXIF), reset interrupt mask (XXMK) and set interrupt 
enable (EI)
 
Disable interrupt (MASK)
Writing to SIOp makes SOp 
and SCKp signals out 
(communication starts)
 
Read transmit data from storage area and write it 
to SIOp.    Update transmit data pointer.
 
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Remarks 1.  <1> to <8> in the figure correspond to <1> to <8> in Figure 12-46  Timing Chart of Master 
Transmission/Reception (in Continuous Transmission/Reception  Mode). 
 2. 
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 
<R> 
<R>