Datasheet

Section 23 Power-Down Modes
Rev.6.00 Mar. 18, 2009 Page 833 of 980
REJ09B0050-0600
Software Standby Mode Application Example: Figure 23.2 shows an example in which a
transition is made to software standby mode at the falling edge on the NMI pin, and software
standby mode is cleared at the rising edge on the NMI pin.
In this example, an NMI interrupt is accepted with the NMIEG bit in INTCR cleared to 0 (falling
edge specification), then the NMIEG bit is set to 1 (rising edge specification), the SSBY bit is set
to 1, and a SLEEP instruction is executed, causing a transition to software standby mode.
Software standby mode is then cleared at the rising edge on the NMI pin.
Oscillator
NMI
NMIEG
SSBY
NMI exception
handling
NMIEG=1
SSBY=1
SLEEP instruction
Software standby mode
(power-down mode)
Oscillation
stabilization
time t
OSC2
NMI exception
handling
Figure 23.2 Software Standby Mode Application Example