RX610 Group
8. Low Power Consumption
R01UH0032EJ0120 Rev.1.20
Page 195 of 1006
Feb 20, 2013
8.5.3.4
Example of Software Standby Mode Application
Figure 8.2 shows an example where a transition to software standby mode is made at the falling edge on the IRQ pin, and
software standby mode is canceled at the rising edge on the IRQ pin.
In this example, an IRQ interrupt is accepted with the IRQMD[1:0] bits in IRQCRi of the ICU set to 01b (falling edge),
and then the IRQMD[1:0] bits are set to 10b (rising edge). After that, the SSIi bit in SSIER of the ICU and the SSBY bit
in SBYCR are set to 1, and then the WAIT instruction is executed. Thus a transition to software standby mode is made.
After that, software standby mode is canceled at the rising edge on the IRQ pin.
To return from the software standby mode, settings of the interrupt control unit (ICU) are also necessary. For details, see
section 10, Interrupt Control Unit (ICU).
Software standby mode
(power-down state)
IRQ exception handling
IRQMD[1:0] = 10b
SSBY = 1
WAIT instruction
Oscillation
settling time
t
OSC2
IRQ exception handling
01
10
SSBY
SSIER.SSIn
IRQMD[1:0]
IRQ
ICLK
Oscillator
Figure 8.2 Example of Software Standby Mode Application
Summary of Contents for RX600 Series
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