HD6432646 Hitachi, HD6432646 Datasheet - Page 100
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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Notes: *1
2.8.2
When the RES goes low, all current processing stops and the CPU enters the reset state. In reset
state all interrupts are disenabled.
Reset exception handling starts when the RES signal changes from low to high.
The reset state can also be entered by a watchdog timer overflow. For details, refer to section 12,
Watchdog Timer.
66
*2
*3
Reset State
From any state except hardware standby mode, a transition to the reset state occurs whenever RES
goes low. A transition can also be made to the reset state when the
watchdog timer overflows.
From any state, a transition to hardware standby mode occurs when STBY goes low.
Apart from these states, there are also the watch mode, subactive mode, and the subsleep mode.
See section 22, Power-Down Modes.
Exception handling state
Bus-released state
Reset state
RES= High
*1
Figure 2-15 State Transitions
External interrupt request
Program execution state
End of bus request
Bus request
STBY= High, RES= Low
Hardware standby mode
Software standby mode
Power-down state
Sleep mode
*3
*2
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