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Program execution state
Exception handling state
Program halt state
Bus-released state
Reset state
*
End of bus
request
Bus
request
Interrupt
request
SLEEP instruction
= High
= High,
= Low
Notes: From any state, a transition to hardware standby mode occurs when
goes low.
*
From any state except hardware standby mode, a transition to the reset state
occurs whenever
goes low. A transition can also be made to the reset state
when the watchdog timer overflows.
Bus
request
End of
bus request
Request for
exception
handling
End of
exception
handling
Figure 2.13 State Transitions
2.9
Usage Note
2.9.1
Notes on Using the Bit Operation Instruction
Instructions BSET, BCLR, BNOT, BST, and BIST read data in byte units, and write data in byte
units after bit operation. Therefore, attention must be paid when these instructions are used for
ports or registers including write-only bits.
Instruction BCLR can be used to clear the flag in the internal I/O register to 0. If it is obvious that
the flag has been set to 1 by the interrupt processing routine, it is unnecessary to read the flag
beforehand.
Summary of Contents for H8S/2627
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