Datasheet

MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor Low-Voltage Inhibit (LVI) 377
Technical Data — MC68HC908LJ12
Section 21. Low-Voltage Inhibit (LVI)
21.1 Contents
21.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .377
21.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .377
21.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .378
21.4.1 Interrupt LVI Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . .380
21.4.2 Forced Reset Operation. . . . . . . . . . . . . . . . . . . . . . . . . . .380
21.4.3 Voltage Hysteresis Protection . . . . . . . . . . . . . . . . . . . . . .380
21.4.4 LVI Trip Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .381
21.5 LVI Status Register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .381
21.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .382
21.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .382
21.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .382
21.2 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
.
21.3 Features
Features of the LVI module include:
• Programmable LVI interrupt and reset
• Selectable LVI trip voltage
• Programmable stop mode operation