H8SXSLASH1663R datasheet(137/1504 Pages) RENESAS

部品番号	H8SX/1663R

部品情報	Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series

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Section 5 Voltage Detection Circuit (LVD)

Rev. 2.00 Sep. 24, 2008 Page 105 of 1468

REJ09B0412-0200

Section 5 Voltage Detection Circuit (LVD)

The voltage detection circuit (LVD) is only supported by the H8SX/1668M Group.

This circuit is used to monitor Vcc. The LVD is capable of internally resetting the LSI when Vcc

falls and crosses the voltage detection level. An interrupt can also be generated.

5.1

Features

•

Voltage-detection circuit

Capable of detecting the power-supply voltage (Vcc) becoming less than or equal to Vdet.

Capable of generating an internal reset or interrupt when a low voltage is detected.

A block diagram of the voltage detection circuit is shown in figure 5.1.

Vcc

LVDF

LVDE

LVDRI

LVDMON

On-chip reference

voltage

(for sensing Vdet)

[Legend]

LVDE:

LVD enable

LVDRI:

LVD reset / interrupt select

LVDMON: LVD monitor

LVDF:

LVD flag

Power-supply

stabilization

time

generation

circuit

Reset /

interrupt

control

circuit

Voltage-monitoring

reset

Voltage-monitoring

interrupt

−

Figure 5.1 Block Diagram of Voltage-Detection Circuit

H8SX/1663R データシート(PDF) 137 Page - Renesas Technology Corp

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