Renesas RA Series Quick Design Guide

Renesas RA Family RA4 Quick Design Guide
R01AN5988EU0100 Rev.1.00 Page 44 of 51
Jul.21.21
Table 16. Specifications of the lower power mode functions
Item
Specification
Reducing power consumption by modifying clock
signals
The frequency division ratio can be selected
independently for the system clock (ICLK),
peripheral module clock (PCLKA, PCLKB, PCLKC,
PCLKD), and flash interface clock (FCLK).*
1
Module stop
Functions can be stopped independently for each
peripheral module.
Low-power modes
• Sleep mode
• Software Standby mode
• Snooze mode
•
Deep Software Standby mode
Power control modes
Three operating power control modes:
• High-speed mode
• Low-speed mode
•
Subosc-speed mode
TrustZone Filter*
2
Security attributes can be set for each register
Notes: 1. For details, see the chapter “Clock Generation Circuit” in the Hardware User’s Manual.
2. For devices that support TrustZone security features.
The following table lists the conditions to transition to low power modes, the states of the CPU and the
peripheral modules, and the method for cancelling each mode.
Table 17. Low Power Consumption Modes
State of
operation*
1
Sleep Mode
All-Module Clock
Stop Mode
Software
Standby Mode
Deep Software
Standby Mode
Transition
condition
WFI instruction
while
SBYCR.SSBY=0
WFI instruction while
SBYCR.SSBY=1 and
DPSBYCR.DPSBY=0
Snooze request
trigger in
Software Standby
mode.
SNZCR.SNZE=1
WFI instruction while
SBYCR.SSBY=1 and
DPSBYCR.DPSBY=1
Canceling
method
All interrupts.
Any reset
available in the
mode.
Interrupts defined for
this mode.
Any reset available in
the mode.
Interrupts defined
for this mode.
Any reset
available in the
mode.
Interrupts defined for
this mode.
Any reset available in
the mode.
State after
cancellation by
an interrupt
Program
execution state
(interrupt
processing)
Program execution
state (interrupt
processing)
Program
execution state
(interrupt
processing)
Reset state
State after
cancellation by
a reset
Reset state
Reset state
Reset state
Reset state
Notes: 1. Refer to the table “Operating Conditions of Each Low Power Mode” in the Hardware User’s Manual
for additional details.
RA4 devices include register settings that allow the MCU to operate with lower power consumption in Normal
mode and Sleep mode. These modes are referred to as the Operating Power Control Modes and are
controlled by the OPCCR register.
The following is a summary of the Operating Power Consumption Control modes and the maximum
permissible clocking and voltage levels under each mode.

Renesas RA Series Specifications

General

Brand	Renesas
Model	RA Series
Category	Microcontrollers
Language	English