Figure 21.1 Mode Transition Diagram; Table 21.1 Low Power Consumption Mode Transition Conditions - Hitachi H8S/2628 Hardware Manual

Program execution state
SCK2 to
SCK0 = 0
Notes: 1. All interrupts
2. NMI and IRQ0 to IRQ5
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
From any state, a transition to hardware standby mode occurs when

Table 21.1 Low Power Consumption Mode Transition Conditions

Status of Control
Bit at Transition
Pre-Transition
State SSBY
High-speed/ 0
Medium-speed
1
Rev. 1.0, 09/02, page 478 of 568
Reset state
pin = High
High-speed mode
(main clock)
SCK2 to
SCK0 0
Medium-speed
mode
(main clock)
: Transition after exception processing
is driven low.

Figure 21.1 Mode Transition Diagram

State after Transition
Invoked by SLEEP
Command
Sleep
Software standby
pin = High
pin = Low
SLEEP command
1
Any interrupt *
SLEEP
command
External
2
interrupt *
: Low power dissipation mode
State after Transition Back
from Low Power Mode
Invoked by Interrupt
High-speed/Medium-speed
High-speed/Medium-speed
Program-halted state
pin = Low
Hardware
standby mode
SSBY = 0
Sleep mode
(main clock)
SSBY = 1
Software
standby mode
is driven low.