D17133CS datasheet(192/289 Pages) NEC

192 / 289 page

CHAPTER 16

RESET

177

Figure 16-4. Example of the Power-Down Reset Operation

Note The undefined operation area refers to the area in which operation specified for the

µPD17120 subseries

is not assured. However, even in this area, the power-down reset function operates, thus continuing to

generate resets until all the other functions within the microcontroller are stopped.

VDD

(V)

5.0

4.5

2.7

State of

oscillation

Period in which

the microcon-

troller is guar-

anteed to

operate

Power-down

reset signal

Operation state

of the micro-

controller

3.5

Oscillating

Guaranteed period

Power-on

reset signal

Oscillating

mode

Reset state

Power-down reset

Oscillation stop

Undefined periodNote

Time (t)

Maximum voltage detected by the

power-down reset function: 4.5V

Typical voltage detected by the

power-down reset function: 3.5V

Voltage at which the power-down

reset function terminates=

power-on reset voltage (B): C

VDD

GND

RESET

PD17120

Subseries

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