Datasheet

MC68HC908LJ24/LK24 — Rev. 2.1 Data Sheet
Freescale Semiconductor Low-Voltage Inhibit (LVI) 421
Data Sheet — MC68HC908LJ24
Section 22. Low-Voltage Inhibit (LVI)
22.1 Contents
22.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .421
22.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .421
22.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .422
22.4.1 Polled LVI Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .424
22.4.2 Forced Reset Operation. . . . . . . . . . . . . . . . . . . . . . . . . . .424
22.4.3 Voltage Hysteresis Protection . . . . . . . . . . . . . . . . . . . . . .424
22.4.4 LVI Trip Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .425
22.5 LVI Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .425
22.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .426
22.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .426
22.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .426
22.2 Introduction
This section describes the low-voltage inhibit (LVI) module, which
monitors the voltage on the V
DD
pin and can force a reset when the V
DD
voltage falls below the LVI trip falling voltage, V
TRIPF
.
22.3 Features
Features of the LVI module include:
• Programmable LVI interrupt and reset
• Selectable LVI trip voltage
• Programmable stop mode operation