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H8/3690 Datasheet

  • H8/3690

  • 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Seri...

  • 2454.14KB

  • 432页

  • RENESAS

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2.7
CPU States
There are four CPU states: the reset state, program execution state, program halt state, and
exception-handling state. The program execution state includes active mode and subactive mode.
For the program halt state there are a sleep mode, standby mode, and sub-sleep mode. These states
are shown in figure 2.11. Figure 2.12 shows the state transitions. For details on program execution
state and program halt state, refer to section 6, Power-Down Modes. For details on exception
processing, refer to section 3, Exception Handling.
CPU state
Reset state
The CPU is initialized
Program
execution state
Active
(high speed) mode
The CPU executes successive program
instructions at high speed,
synchronized by the system clock
Subactive mode
The CPU executes
successive program
instructions at reduced
speed, synchronized
by the subclock
Power-down
modes
Program halt state
A state in which some
or all of the chip
functions are stopped
to conserve power
Sleep mode
Standby mode
Subsleep mode
Exception-
handling state
A transient state in which the CPU changes
the processing flow due to a reset or an interrupt
Figure 2.11 CPU Operation States
Rev. 4.00, 03/04, page 40 of 400

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