Renesas rl78 User Manual

Page of 1004
 
RL78/G1A 
 
CHAPTER  12   SERIAL  ARRAY  UNIT 
R01UH0305EJ0200  Rev.2.00 
 
 
526  
Jul 04, 2013 
Figure 12-91.  Flowchart of SNOOZE Mode Operation (EOCm1 = 0, SSECm = 0/1 or EOCm1 = 1, SSECm = 0) 
 
Setting start
Does TSFmn = 0 on all
channels?
No 
Yes
Writing 1 to the STmn bit
 SEmn = 0
Setting SSCm register
(SWCm = 1)
Entered the STOP mode
The operation of all channels is also stopped to switch to the 
STOP mode.
SNOOZE mode setting
f
CLK
 supplied to the SAU is stopped.
<1>
<2>
<3>
<4>
<5>
<7>
Channel 1 is specified for UART reception. 
Change to the UART reception baud rate in SNOOZE mode 
(SPSm register and bits 15 to 9 in SDRm1 register).
<6>
<9> 
<8>
<10> 
<11> 
<12> 
The mode switches from SNOOZE to normal 
operation.
SAU default setting
Clear interrupt request flag (XXIF), reset interrupt mask (XXMK) 
 and set interrupt enable(IE).
Enable interrupt
RxDq edge detected
(Entered the SNOOZE mode)
  Clock supply
(UART receive operation)
Transfer end interrupt (INTSRq) or 
error interrupt (INTSREq) generated
Nor
mal opetar
ion
ST
OP mode
SNOOZE mode
 
To operation stop status (SEm1 = 0)
Reading receive data from
the SDRmn[7:0] bits (RXDq
register) (8 bits) or the
SDRmn[8:0] bits (9 bits)
Writing 1 to the STm1 bit
Clear the SWCm bit to 0
INTSREq
Change to the UART
reception baud rate in
normal operation
Normal operation
Set the SPSm register and bits 15 to 9 in the 
SDRm1 register.
Nor
mal opetar
ion
Writing 1 to the SSmn bit
 SEm1 = 1
INTSRq
Reading receive data from
the SDRmn[7:0] bits (RXDq
register) (8 bits) or the
SDRmn[8:0] bits (9 bits)
Writing 1 to the STm1 bit
Clear the SWCm bit to 0
Error processing
Change to the UART
reception baud rate in
normal operation
Writing 1 to the SSmn bit
Writing 1 to the SSmn bit
Normal operation
Communication wait status
Reset SNOOZE mode setting.
To communication wait status (SEmn = 1)
 
 
Remarks 1.  <1> to <11> in the figure correspond to <1> to <11> in Figure 12-89  Timing Chart of SNOOZE 
Mode Operation (EOCm1 = 0, SSECm = 0/1) and Figure 12-90  Timing Chart of SNOOZE Mode 
Operation (EOCm1 = 1, SSECm = 0)
 2. 
m = 0;  q = 0 
<R>