M68ICS08GR datasheet(187/408 Pages) FREESCALE

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Low-Voltage Inhibit (LVI)

LVI Status Register

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Low-Voltage Inhibit (LVI)

187

14.4.4 LVI Trip Selection

The LVI5OR3 bit in the configuration register selects whether the LVI is

configured for 5V or 3V protection.

NOTE:

The microcontroller is guaranteed to operate at a minimum supply

voltage. The trip point (VTRIPF [5 V] or VTRIPF [3 V]) may be lower than

this. (See Electrical Specifications for the actual trip point voltages.)

14.5 LVI Status Register

The LVI status register (LVISR) indicates if the VDD voltage was

detected below the VTRIPF level.

LVIOUT — LVI Output Bit

This read-only flag becomes set when the VDD voltage falls below the

VTRIPF trip voltage. See Table 14-1. Reset clears the LVIOUT bit.

Address:

$FE0C

Bit 7

654321

Bit 0

Read:

LVIOUT

0000000

Write:

Reset:

00000000

= Unimplemented

Figure 14-3. LVI Status Register (LVISR)

Table 14-1. LVIOUT Bit Indication

VDD

LVIOUT

VDD > VTRIPR

VDD < VTRIPF

VTRIPF < VDD < VTRIPR

Previous value

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