H8S2245 datasheet(100/818 Pages) RENESAS

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Section 2 CPU

Rev.3.00 Mar. 26, 2007 Page 58 of 772

REJ09B0355-0300

End of bus request

Bus request

Program execution

state

Bus-released state

Sleep mode

Exception-handling state

External interrupt

Software standby mode

RES = high

Reset state*1

STBY = high, RES = low

Hardware standby mode*2

Power-down state

Notes: 1.

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.

SLEEP

instruction

with

SSBY = 0

SLEEP

instruction

with

SSBY = 1

Interrupt

request

End of bus

request

Bus

request

Request for

exception

handling

End of

exception

handling

Figure 2.15 State Transitions

2.8.2

Reset State

When the

RES input goes low all current processing stops and the CPU enters the reset state. All

interrupts are masked in the reset state. 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 11,

Watchdog Timer.

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