Renesas RL78 Series User Manual page 479

RL78/G1D
13.5.7 SNOOZE mode function
SNOOZE mode makes CSI operate reception by SCKp pin input detection while the STOP mode. Normally CSI stops
communication in the STOP mode.
operation by detecting SCKp pin input.
When using the CSI in SNOOZE mode, make the following setting before switching to the STOP mode (see Figure 12-
70 Flowchart of SNOOZE Mode Operation (once startup) and Figure 12-72 Flowchart of SNOOZE Mode Operation
(continuous startup)).
● When using the SNOOZE mode function, set the SWCm bit of serial standby control register m (SSCm) to 1 just
before switching to the STOP mode. After the initial setting has been completed, set the SSm0 bit of serial channel
start register m (SSm) to 1.
● The CPU shifts to the SNOOZE mode on detecting the valid edge of the SCKp signal following a transition to the
STOP mode. A CSIp starts reception on detecting input of the serial clock on the SCKp pin..
Cautions 1. The SNOOZE mode can only be specified when the high-speed on-chip oscillator clock is selected
for f .
CLK
2. The maximum transfer rate when using CSIp in the SNOOZE mode is 1 Mbps.
Remark m = 0; p = 00
R01UH0515EJ0120 Rev.1.20
Dec 16, 2016
But, using the SNOOZE mode makes reception CSI operate unless the CPU
CHAPTER 13 SERIAL ARRAY UNIT
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