Datasheet

Table Of Contents
Section 22 Power-Down Modes
REJ09B0140-0900 Rev. 9.00 Page 683 of 846
Sep 16, 2010
H8S/2215 Group
Program-halted state
Program execution state
Reset Execution state
SCK2 to
SCK0 = 0
SCK2 to
SCK0 0
SLEEP command
Any interrupt
SLEEP
command
External
interrupt
*
USB
suspend/resume
interrupt
STBY pin = High
RES pin = Low
STBY pin = Low
SSBY = 0
SSBY = 1
RES pin = High
: Transition after exception processing : Low power dissipation mode
Reset state
Manual
reset
state
High-speed mode
(main clock)
Hardware
standby mode
Software
standby mode
Sleep mode
(main clock)
Medium-speed
mode
(main clock)
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 power-on reset state occurs when
RES is driven low. From any state except hardware standby mode, and power-on reset state, a
transition to the manual reset state occurs when MRES is driven low.
From any state, a transition to hardware standby mode occurs when STBY is driven low.
* NMI and IRQ0 to IRQ7
Figure 22.1 Mode Transition Diagram
Table 22.2 Low Power Dissipation 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