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21.4.4
Software Standby Mode Application Example
Figure 21.3 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 SYSCR 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
φ
NMI
NMIEG
SSBY
NMI exception
handling
NMIEG = 1
SSBY = 1
Oscillation
stabilization
time t
OSC2
Software standby mode
(power-down mode)
NMI exception
handling
SLEEP instruction
Figure 21.3 Software Standby Mode Application Example
Содержание H8S/2627
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