r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 703

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 33.2
Step (1)
Step (2)
Step (3)
Step (4)
Step (5)
Step (6)
Step (7)
Step (8)
Notes:
VCA20: Bit in VCA2 register
1. Execute this routine to handle all interrupts generated in wait mode.
2. Do not set the VCA20 bit to 0 with the instruction immediately after setting the VCA20 bit to 1. Also, do not do the opposite.
3. When the VCA20 bit is set to 1, do not set the CM10 bit to 1 (stop mode).
4. When the MCU enters wait mode, follow 9.7.2 Wait Mode.
However, this does not apply if it is not necessary to start the high-speed clock or high-speed on-chip oscillator during the interrupt routine.
(internal power low consumption enabled)
(internal power low consumption disabled)
(Wait until XIN clock or high-speed on-chip
Procedure for enabling reduced internal
power consumption using VCA20 bit
oscillator clock oscillation stabilizes)
high-speed on-chip oscillator mode
high-speed on-chip oscillator clock
high-speed on-chip oscillator clock
low-speed on-chip oscillator mode
Enter high-speed clock mode or
Enter low-speed clock mode or
WAIT Instruction is Executed to Enter Wait Mode
Setting Procedure for Reducing Internal Power Consumption Using VCA20 Bit when
Stop XIN clock and
Enter wait mode
Start XIN clock or
VCA20 ← 1
VCA20 ← 0
(4)
(2, 3)
(2)
Exit wait mode by interrupt
Step (5)
Step (6)
Step (7)
Step (8)
Step (1)
Step (2)
Step (3)
(internal power low consumption enabled)
(This is automatically set when exiting wait mode)
(Wait until XIN clock or high-speed on-chip
(internal power low consumption disabled)
or high-speed on-chip oscillator clock
oscillator clock oscillation stabilizes)
high-speed on-chip oscillator mode
high-speed on-chip oscillator clock
low-speed on-chip oscillator mode
Enter high-speed clock mode or
Enter low-speed clock mode or
Interrupt handling completed
Stop XIN clock and
In interrupt routine
Interrupt handling
Start XIN clock
VCA20 ← 1
VCA20 ← 0
(Note 1)
33. Reducing Power Consumption
(2)
(2, 3)
If it is necessary to start
the high-speed clock or
high-speed on-chip oscillator
during the interrupt routine,
execute steps (6) to (7)
in the routine.
If the high-speed clock or
high-speed on-chip oscillator
starts during the interrupt
routine, execute steps (1) to
(3) at the end of the routine.
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