Renesas RL78/G1P Hardware User Manual page 473

16-bit single-chip microcontroller

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(2) SNOOZE mode operation (Abnormal Operation <1>)

Abnormal operation <1> is the operation performed when a communication error occurs while SSECm = 0.

Because SSECm = 0, an error interrupt (INTSREq) is generated when a communication error occurs.

Figure 11-115. Timing Chart of SNOOZE Mode Operation (Abnormal Operation <1>)

CPU operation status

Normal operation STOP mode

Clock request signal

(internal signal)

Note Only read received data while SWCm = 1.

Caution 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).

Remarks 1. <1> to <11> in the figure correspond to <1> to <11> in Figure 11-116 Flowchart of SNOOZE Mode

Operation (Normal Operation/Abnormal Operation <1>).

2. m = 0; q = 0

R01UH0895EJ0100 Rev.1.00

Nov 29, 2019

Receive data 1

Shift operation

Data reception

CHAPTER 11 SERIAL ARRAY UNIT

Normal operation

Receive data 1

Receive data 2

Shift operation

Data reception