Mode Transition Conditions - Hitachi H8/3664 Hardware Manual

6.3

Mode Transition Conditions

Figure 6.1 shows the transitions among these operation modes. Table 6.3 shows the transition
mode after the SLEEP instruction is executed and when an interrupt occurs. Table 6.4 indicates
the internal states in each mode.
Reset state
Program halt state
SSBY = 1
Standby mode
Notes: 1. A transition between different modes cannot be made to occur simply because an interrupt request is
generated. Make sure that interrupt handling is performed after the interrupt is accepted.
2. Details on the mode transition conditions are given in the explanation of each mode in sections 6.4 to 6.9.
Program execution state
SLEEP
instruction
Active mode
Interrupt
LSON = 0,
DTON = 1
Direct
transition
SLEEP
interrupt
instruction
Subactive
Figure 6.1 Mode Transition Diagram
LSON = 0
Direct transition
interrupt
SLEEP
instruction
Interrupt
SLEEP
instruction
LSON = 1,
DTON = 1
Direct
transition
interrupt
SLEEP
instruction
SLEEP
instruction
mode
Interrupt
LSON = 1
Direct transition
interrupt
Program halt state
SMSEL = 0
Sleep mode
Interrupt
Interrupt
Subsleep mode
SMSEL = 1
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