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RL78/G1A CHAPTER 12 SERIAL ARRAY UNIT
R01UH0305EJ0200 Rev.2.00 496
Jul 04, 2013
Figure 12-71. Flowchart of SNOOZE Mode Operation (Once Startup)
SCKp edge detected
(Entered the SNOOZE mode)
Supplying a clock to CSIp
(CSIp is receive operation)
TSFmn = 0 for all channels?
No
Yes
Write 1 to STm0 bit
SAU default setting
Setting SSCm register
(SWCm = 1, SSECm = 0)
Entered the STOP mode
Reading receive data from
SIOp (=SDRmn[7:0])
Write 1 to STm0 bit
Write 1 to SWCm bit
Write 1 to SSm0 bit
Setting SNOOZE mode
CPU/peripheral hardware clock fCLK supplied
to the SAU is stopped.
<1>
<2>
<3>
<4>
<5>
<7>
<8>
<9>
<10>
Reset SNOOZE mode setting
<6>
The mode switches from SNOOZE to normal operation.
Become the communication wait status (SEm0 = 1)
SNOOZE mode operation
Transfer interrupt (INTCSIp) is
generated
(CSIp is receive completion)
End of SNOOZE mode
Write 1 to SSm0 bit
<11>
Become the operation STOP status (SEm0 = 0)
SMRm0, SCRm0: Communication setting
SDRm0[15:9]: Setting 0000000B
Become the operation STOP status (SEm0 = 0)
It becomes communication ready state (SEm0 = 1) under
normal operation
Clear interrupt request flag (XXIF), reset interrupt mask (XXMK)
and enable interrupt processing.
Enables interrupt
processing
Normal operation
SNOOZE mode
STOP mode Normal operation
Remarks 1. <1> to <11> in the figure correspond to <1> to <11> in Figure 12-70 Timing Chart of SNOOZE
Mode Operation (Once Startup).
2. m = 0; p = 00
<R>