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73
RES
= 0
Power-on reset state
Manual reset state
Sleep mode
Standby mode
Program execution state
Bus release state
Exception processing state
RES
= 1
MRES
= 1
RES
= 1
When an interrupt source
or DMA address error occurs
NMI interrupt
source occurs
Exception
processing
ends
Bus request
generated
Exception
processing
source occurs
Bus request
cleared
Bus request
generated
Bus request
cleared
SBY bit
cleared
for SLEEP
instruction
SBY bit set
for SLEEP
instruction
From any state
when
RES
= 0
From any state when
RES
= 1 and
MRES
= 0
Reset states
Power-down state
Bus request
generated
Bus request
cleared
Figure 2.6 Transitions between Processing States
Reset State: The CPU resets in the reset state. When the
RES
pin level goes low, a power-on reset
results. When the
RES
pin is high and MRES is low, a manual reset will occur.
Exception Processing State: The exception processing state is a transient state that occurs when
exception processing sources such as resets or interrupts alter the CPU’s processing state flow.
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