M62002FP datasheet(7/10 Pages) RENESAS

7 / 10 page

M62001L/FP to M62008L/FP

Rev.1.00 Sep 14, 2005 page 7 of 9

RESET output (Detection of 2.15 V)

The

RESET outputs a signal to prevent the microcomputer from malfunctioning due to a drop in supply voltage.

When powering up,

RESET is kept at low level until the supply voltage reaches V

SH. If the supply voltage rises to

VSH, RESET is set to high level. By inserting a capacitor between the Cd pin and GND, it is possible to produce a

desired delay time (td). To set a delay time, equation below is used.

td ≈ 1.52 × 10

× C (s)

Once the supply voltage has exceeded VSH and the RESET output is set to high level, RESET maintains the high

level until the supply voltage drops to VBATT. When the supply voltage drops to VBATT, RESET goes low thereby

resetting and initializing the microcomputer.

The

RESET output has a large hysteresis voltage of approximately 2 V between the rise in supply voltage at power-

up and its fall.

RESET Output Voltage vs. Supply Voltage

2345

Supply Voltage VCC (V)

VSH

VBATT

Figure 3

RESET Output (Detection of 2.15 V)

M62002FP Datasheet(PDF) 7 Page - Renesas Technology Corp