µPD178023, 178024
5. STANDBY FUNCTION
There are the following two standby functions to reduce the system power consumption.
• HALT mode : The CPU operating clock is stopped.
The average consumption current can be reduced by intermittent operation in combination with
the normal operating mode.
• STOP mode : The system clock oscillation is stopped. All operations by the system clock are stopped and
current consumption can be considerably reduced.
Figure 5-1. Standby Function
System Clock Operation
HALT
Instruction
STOP
Instruction
Interrupt
Request
Interrupt
Request
HALT Mode
STOP Mode
(System clock
oscillation stopped)
(Clock supply to CPU is
stopped, oscillation
continued)
6. RESET FUNCTION
There are the following three reset methods.
• External reset input by RESET pin
• Internal reset by watchdog timer runaway time detection
• Internal reset by Power-On Clear (POC).
Data Sheet U14126EJ1V0DS00
31
NEC [ NEC ]
