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HD64F2638F20J Datasheet, PDF (992/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series
Section 23A Power-Down Modes [HD64F2636F, HD64F2638F, HD6432636F,
HD6432638F, HD64F2630F, HD6432630F, HD64F2635F, HD6432635F, HD6432634F]
H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
23A.6.4 Software Standby Mode Application Example
Figure 23A-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
Software standby mode
handling
(power-down mode)
NMIEG=1
SSBY=1
SLEEP instruction
Oscillation
stabilization
time tOSC2
NMI exception
handling
Figure 23A-3 Software Standby Mode Application Example
Page 942 of 1458
REJ09B0103-0800 Rev. 8.00
May 28, 2010