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Renesas RA Family
(A)
Power On
Reset
(a)
(B)
Normal Mode
CPU : Clock Source
MOSC
(b)
(C)
Normal Mode
CPU : Clock Source
HOCO
(c)
(D)
CPU:
Normal Mode
(f)
Subsystem clock
CPU : Clock Source
CPU : Clock Source
operation
MOCO
MOCO
(d)
(E)
Normal Mode
CPU : Clock Source
LOCO
(e)
(F)
(LP)
Normal Mode
CPU : Clock Source
CPU : Clock Source
SOSC
SOSC
Clock Change Mode -
Transition
In the above Figure 18, the blue colored oval shaped blocks (B) though (F) represent the different clock
states used in the application, and (b) through (f) labeled arrows are different transition path it takes when
changing the clock.
The yellow blocks are the different LPM states as applicable to the MCU, and the (1) through (8) numbered
arrows, represents the transition path at the different Low Power Modes.
Note: The dotted block represents the Clock Change Mode transition on the left and LPM Transition on the
right as shown in Figure 18.
Note: The Deep Software Standby Mode and Snooze Mode is entered via Software Standby mode. For the
Snooze and Deep Software Standby mode, from the application perspective the MCU and LPM
drivers handles the Software Standby mode internally, while it is configured for the Snooze or Deep
Software Standby Mode.
R11AN0471EU0104 Rev.1.04
Oct.1.21
Getting Started with Low Power Applications for RA6 and
Internal Reset State
Clock Sources
Low Power Mode
(LP)
(SP)
(LP)
(LP)
(SP)
(LP)
(LP)
(SP)
(LP)
(LP)
(SP)
(LP)
(LP)
(SP)
Figure 18. Clock Changing and LPM Transition
(1)
(SP)
N
(2)
(LP) /(SP)
o
CPU:
r
Subsystem clock
m
(6)
(RTC)
operation
a
l
(3)
(SP)
Software Standby
M
o
(RTC)
(4)
d
e
(8b)
Low Power Mode - Transition
RA4 Groups
(LP) – Long Press Event
(SP) – Short Press Event
(RTC) – RTC Event
(Timer) – Timer Event
Sleep Mode
Snooze Mode
(5b)
(5a)
(Timer)
(Timer)
Mode
(7)
Deep Software
Standby Mode
(8a)
(LP) /(SP)
Internal Reset State
Page 21 of 40
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