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5. Power-Down Modes
Reset state
Program halt state
SSBY = 1,
TMA3 = 0,
LSON = 0
Standby mode
SSBY = 1,
TMA3 = 1
Watch mode
: Transition caused by exception handling
1.
A transition between different modes cannot be made to occur simply because an interrupt request is
generated. Make sure that the interrupt is accepted and interrupt handling is performed.
2.
Details on the mode transition conditions are given in the explanations of each mode, in sections 5.2
through 5.8.
3. The module standby mode for the LCD controller is initiated by setting a register within the LCD
controller itself, and so is not shown in this diagram.
Notes: 1. Timer A interrupt, IRQ
2. Timer A interrupt, timer C interrupt*, timer IRQ
3. All interrupts*
4. IRQ
interrupt, IRQ
0
* The timer C, SCI1, and IRQ
provided in the H8/3854 Group.
Rev.3.00 Jul. 19, 2007 page 102 of 532
REJ09B0397-0300
Program execution state
LSON = 0, MSON = 0
Active (high-speed)
4 *
LSON = 0,
MSON = 1
4 *
(medium-speed)
1 *
1 *
LSON = 1,
TMA3 = 1
Subactive mode
interrupt, WKP
0
interrupt, WKP
1
0
interrupts are functions of the H8/3857 Group only, and are not
2
Figure 5.1 Operation Mode Transition Diagram
mode
1 *
3 *
3 *
Active
mode
SLEEP
instruction
to WKP
interrupts
0
7
to IRQ
interrupts*, WKP
0
4
to WKP
interrupts
7
Program halt state
SSBY = 0,
LSON = 0
Sleep mode
SSBY = 0,
LSON = 1,
TMA3 = 1
Subsleep mode
2 *
Power-down mode
to WKP
interrupts
0
7
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