Rev. 1.0, 09/02, page 478 of 568
Program-halted state
Program execution state
SCK2 to
SCK0 = 0
SCK2 to
SCK0 0
SLEEP command
Any interrupt
*
1
SLEEP
command
External
interrupt
*
2
pin = High
pin = Low
pin = Low
SSBY = 0
SSBY = 1
pin = High
: Transition after exception processing
: Low power dissipation mode
Reset state
High-speed mode
(main clock)
Hardware
standby mode
Software
standby mode
Sleep mode
(main clock)
Medium-speed
mode
(main clock)
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
is driven low.
From any state, a transition to hardware standby mode occurs when
is driven low.
Figure 21.1 Mode Transition Diagram
Table 21.1 Low Power Consumption Mode Transition Conditions
Status of Control
Bit at Transition
Pre-Transition
State
SSBY
State after Transition
Invoked by SLEEP
Command
State after Transition Back
from Low Power Mode
Invoked by Interrupt
0 Sleep High-speed/Medium-speed
High-speed/
Medium-speed
1 Software
standby
High-speed/Medium-speed
Summary of Contents for H8S/2627
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