H8SX1622 Datasheet, PDF (929/1056 Pages) Renesas Technology Corp – Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

Section 24 Power-Down Modes
24.7.4 Software Standby Mode Application Example
Figure 24.2 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
Iφ
NMI
NMIEG
SSBY
NMI exception
handling
NMIEG = 1
SSBY = 1
Software standby mode
(power-down mode)
SLEEP instruction
Oscillation
settling time
t_OSC2
NMI exception
handling
Figure 24.2 Software Standby Mode Application Example
Rev. 1.00 Nov. 01, 2007 Page 901 of 1024
REJ09B0414-0100