Section 28
Power-Down Modes
Rev. 1.00 Mar. 12, 2008 Page 1065 of 1178
REJ09B0403-0100
28.2
Mode Transitions and LSI States
Figure 28.1 shows the enabled mode transition diagram. The mode transition from program
execution state to program halt state is performed by the SLEEP instruction. The mode transition
from program halt state to program execution state is performed by an interrupt. The
STBY
input
causes a mode transition from any state to hardware standby mode. The
RES
input causes a mode
transition from a state other than hardware standby mode to the reset state. Table 28.2 shows the
LSI internal states in each operating mode.
Program halt state
Program execution state
SCK2 to
SCK0 are
0
SCK2 to
SCK0 are
not 0
SLEEP instruction
SLEEP
instruction
External
interrupt
*
Any interrupt
*
STBY pin = High
RES pin = Low
STBY pin = Low
SSBY = 0
SSBY = 1,
PSS = 0
RES pin = High
: Transition after exception handling
: Power-down mode
Reset state
High-speed mode
(main clock)
Medium-speed
mode
(main clock)
Hardware
standby mode
Software
standby mode
Sleep mode
(main clock)
Note:
*
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.
USB suspend/
resume interrupt
Figure 28.1 Mode Transition Diagram
Summary of Contents for H8S Family
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Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
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Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
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Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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