HA16117F Series

17

Selection of External Constants

If the reset duration necessary for the MPU to operate reliably at power-on is known, there is a simple

procedure for selecting external constants, starting from the power-on reset time (t

START

Set power-on

Set reset high

Select external

Check watchdog

frequency range

External

constant

values

• Decide reset

• Select external

• Decide reset-clock

• Select external

Figure 4 Procedure for Selecting External Constants

Application Example

SW

0.01

µF

510 k

Ω

750 k

Ω

0.1

µF

Battery

Microprocessor

system

5 V

regulator

Tadj

P-RUN

HA16117F

ACC

GND

PORT

GND

RES

RES