HD64336901G Renesas Technology, HD64336901G Datasheet - Page 66

• Manufacturer Part Number: HD64336901G
• Description: (HD64xxx Series) 16-BIT MICROCONTROLLER
• Manufacturer: Renesas Technology

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. 1.00, 11/03, page 38 of 376
CPU States
CPU state
Program halt state
Reset
occurs
Reset 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
Figure 2.12 State Transitions
Reset
occurs
SLEEP instruction executed
Reset cleared
Reset occurs
The CPU executes successive program
instructions at high speed,
synchronized by the system clock
(high speed) mode
Interrupt
source
Standby mode
Sleep mode
Active
Exception-handling state
Program execution state
Interrupt
source
Exception-
handling
complete
Power-down
modes