Section 2 CPU
Rev. 3.00 Sep. 27, 2007 Page 46 of 758
REJ09B0243-0300
2.6 Processing
States
The CPU has the five processing states: reset, exception handling, program execution, and power-
down. Figure 2.4 shows the CPU state transition.
When internal power-on reset by WDT
or internal manual reset by WDT occurs.
From any state
when
RES
= 0
From any state
when
RES
= 1 and
MRES
= 0
Power-on reset state
Manual reset state
RES
= 0
Reset state
RES
= 1
RES
= 1,
MRES
= 1
Exception
handling state
Exception
processing
source
occurs
Exception
processing
ends
Program
execution state
NMI interrupt or IRQ
interrupt occurs
Sleep mode
SSBY bit = 1 and
STBYMD bit = 1
for SLEEP
instruction
SSBY bit = 0
for SLEEP
instruction
Software
standby mode
Power-down mode
Figure 2.4 Transitions between Processing States
Summary of Contents for SH7124 R5F7124
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Page 68: ...Section 2 CPU Rev 3 00 Sep 27 2007 Page 48 of 758 REJ09B0243 0300 ...
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