Renesas RL78/G13 - Page 679

RL78/G13 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0146EJ0100 Rev.1.00 660
Sep 22, 2011
Figure 12-93. Flowchart of SNOOZE Mode Operation (Normal Operation/Abnormal Operation <1>)
Setting start
Writing 1 to the STmn bit
→ SEmn = 0
Reading receive data to
RxDq (=SDRm1[7:0])
SMRmn, SCRm1: Setting communication
SDRm1
[
15:9
]
: Settin
g
transfer rate
Y
es
Entered the STOP mode
N
o
Error interrupt (INTSREq)
generated?
Y
es
Does TSFmn = 0 on all
channels?
N
o
<1>
Channel 0 is specified for UART transmission.
Channel 1 is specified for UART reception.
Setting the SSCm register
→ SWCm = 1, SSECm = 0
<2>
SNOOZE mode setting
Writing 1 to the SSm1 bit
→ SEm1 = 1
<3>
Communication wait status
f
CLK supplied to the SAU is stopped.
Y
es
N
o
Was an RxDq ed
g
e
detected?
<4>
<5>
Entered the SNOOZE mode
The clock is supplied and UART reception is started.
<6>
<8>
<7>
Writing 1 to the STm1 bit
→ SEm1 = 0
<10>
<11>
The mode switches from SNOOZE to normal operation.
Transfer end interrupt (INTSRq)
generated?
Y
es
N
o
<9>
Clearing 0 to the SWCm bit
Normal processing
Normal operation of UARTq starts.
Error processing
Normal operation of UARTq starts.
Clock request signal is set to low-level
The operation of channels 0 and 1 of unit 0 stop.
(The operation of all channels is also stopped to
switch to the STOP mode.)
The clock request signal is set to the high level, and
f
CLK
(the high-speed on-chip oscillator clock) is requested for
the clock generator. After the oscillation-accuracy
stabilization time passes, supplying a clock to SAU starts.
Remarks 1. <1> to <11> in the figure correspond to <1> to <11> in Figure 12-91. Timing Chart of SNOOZE
Mode Operation (Normal operation mode) and Figure 12-92. Timing Chart of SNOOZE Mode
Operation (Abnormal Operation <1>).
2. 24 to 64-pin products: m = 0; q = 0
80, 100, 128-pin products: m = 0, 1; q = 0, 2
<R>