Figure 20.1 Mode Transition Diagram - Renesas H8S Series Hardware Manual

Section 20 Power-Down Modes
Program execution state
SCK2 to
SCK0 = 0
Notes: When a transition is made between modes by means of an interrupt, the transition cannot be made
on interrupt source generation alone. Ensure that interrupt handling is performed after accepting the
interrupt request.
From any state except hardware standby mode, a transition to the reset state occurs when RES is
driven low.
From any state, a transition to hardware standby mode occurs when STBY is driven low.
* NMI and IRQ0 to IRQ5
Rev. 6.00 Mar 15, 2006 page 492 of 570
REJ09B0211-0600
Reset state
RES pin = High
High-speed mode
(main clock)
SCK2 to
SCK0 ≠ 0
Medium-speed
mode
(main clock)
: Transition after exception processing

Figure 20.1 Mode Transition Diagram

STBY pin = High
RES pin = Low
SLEEP command
Any interrupt
SLEEP
command
External
interrupt *
Program-halted state
STBY pin = Low
Hardware
standby mode
SSBY = 0
Sleep mode
(main clock)
SSBY = 1
Software
standby mode
: Low power dissipation mode