58
Exception handling state
Bus-released state
Hardware standby mode
*
2
Software standby mode
Power-on reset state
*
1
Sleep mode
Power-down state
*
3
Program execution state
End of bus request
Bus request
Interrupt request
External interrupt request
RES= High
Request for exception handling
STBY= High, RES= Low
End of bus
request
Bus request
SLEEP
instruction
with
SSBY = 0
SLEEP
instruction
with
SSBY = 1
Notes: 1.
2.
3.
From any state except hardware standby mode, a transition to the power-on reset state occurs whenever RES
goes low. From any state except hardware standby mode and power-on reset mode, a transition to the manual
reset state occurs whenever MRES 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 Chapter 24 Power-Down States
End of exception
handling
Manual reset state
*
1
MRES= High
Reset state *1
Figure 2-15 State Transitions
2.8.2
Reset State
The CPU enters the reset state when the
RES
pin goes low, or when the
MRES
pin goes low while
manual resets are enabled by the MRESE bit. In the reset state, currently executing processing is
halted and all interrupts are disabled.
For details of MRESE bit setting, see section 3.2.2, System Control Register (SYSCR).
Reset exception handling starts when the
RES
or
MRES
pin* changes from low to high.
The reset state can also be entered in the event of watchdog timer overflow. For details see section
15, Watchdog Timer.
Note: *
MRES
pin in the case of a manual reset.
Содержание H8S/2631
Страница 28: ...xviii Appendix G Package Dimensions 1154 ...
Страница 341: ...316 Transfer SAR or DAR DAR or SAR Block area First block Nth block Figure 9 8 Memory Mapping in Block Transfer Mode ...
Страница 918: ...905 ø DREQ0 DREQ1 tDRQS tDRQH Figure 25 19 DMAC DREQ Input Timing ...
Страница 955: ...943 A 2 Instruction Codes Table A 2 shows the instruction codes ...