UPD784035YGC NEC, UPD784035YGC Datasheet - Page 55

• Manufacturer Part Number: UPD784035YGC
• Description: 16-/8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: NEC

10. STANDBY FUNCTION
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This function is to reduce the power dissipation of the chip, and can be used in the following modes:
These modes are programmable.
The macro service can be started from the HALT mode.
Remark Only the externally input NMI is valid. The watchdog timer cannot be used to release the standby mode
Notes 1. When INTP4 and INTP5 are not masked
(standby)
STOP
HALT mode: Stops supply of the operating clock to the CPU. This mode is used in combination with the normal
operation mode for intermittent operation to reduce the average power dissipation.
IDLE mode: Stops the entire system with the oscillation circuit continuing operation. The power dissipation in
this mode is close to that in the STOP mode. However, the time required to restore the normal program operation
from this mode is almost the same as that from the HALT mode.
STOP mode: Stops the oscillator and thereby to stop all the internal operations of the chip. Consequently, the
power dissipation is minimized with only leakage current flowing.
2. Only interrupt requests that are not masked
(STOP/IDLE mode).
stabilization
oscillation
Waits for
(standby)
IDLE
Figure 10-1. Transition of Standby Status
PD784035Y, 784036Y, 784037Y, 784038Y
operation
Program
Interrupt request of
masked interrupt
End of one processing
Macro service request
End of macro service
(standby)
HALT
service
Macro
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