RL78/G1P
CHAPTER 11 SERIAL ARRAY UNIT
R01UH0895EJ0100 Rev.1.00
456
Nov 29, 2019
(3) SNOOZE mode operation (Abnormal Operation <2>)
Abnormal operation <2> is the operation performed when a communication error occurs while SSECm = 1.
Because SSECm = 1, an error interrupt (INTSREq) is not generated when a communication error occurs.
Figure 11-117. Timing Chart of SNOOZE Mode Operation (Abnormal Operation <2>)
L
<1>
<2>
<3>
<5>
<6>
<7>
<6>
<9>
<4>
P
P
SP
SP
ST
<7>,
<8>
<5>
ST
SS01
SE01
SWC0
SSEC0
SDR01
INTSR0
INTSRE0
TSF01
ST01
RxD0 pin
<10>
<11>
<11>
<11>
CPU operation status
Normal operation STOP mode
SNOOZE mode
STOP mode
SNOOZE mode
Normal operation
Receive data 1
Receive data 2
Receive data 2
Receive data 1
Shift operation
Shift operation
Data reception
Data reception
Shift register 01
Clock request signal
(internal signal)
Read
Note
EOC01
Note
Only read received data while SWCm = 1.
Cautions 1. Before switching to the SNOOZE mode or after reception operation in the SNOOZE mode
finishes, set the STm1 bit to 1 (clear the SEm1 bit, and stop the operation).
And after completion the receive operation, also clearing SWCm bit to 0 (SNOOZE mode
release).
2. When using the SNOOZE mode while SSECm is set to 1, no overrun errors occur. Therefore,
when using the SNOOZE mode, read bits 7 to 0 (RxDq) of the SDRm1 register before
switching to the STOP mode.
Remarks 1.
<1> to <9> in the figure correspond to <1> to <9> in
Figure 11-118 Flowchart of SNOOZE Mode
Operation (Abnormal Operation <2>)
.
2.
m = 0; q = 0