HD64F3670 RENESAS [Renesas Technology Corp], HD64F3670 Datasheet - Page 58

• Manufacturer Part Number: HD64F3670
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

2.7
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. In the program halt
state there are a sleep mode, and standby 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.
Rev. 2.0, 03/02, page 34 of 298
CPU States
CPU state
A state in which some
or all of the chip
functions are stopped
to conserve power
A transient state in which the CPU changes
the processing flow due to a reset or an interrupt
The CPU is initialized
Program halt state
Figure 2.11 CPU Operation States
execution state
handling state
Reset state
Exception-
Program
The CPU executes successive program
instructions at high speed,
synchronized by the system clock
The CPU executes
successive program
instructions at reduced
speed, synchronized
by the subclock
(high speed) mode
Standby mode
Sleep mode
Active
Power-down
modes