參數(shù)資料
型號(hào)： MC68HC08GP8AMFB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PQFP44
封裝： PLASTIC, QFP-44
文件頁(yè)數(shù)： 12/126頁(yè)
文件大?。?/td> 4243K
代理商： MC68HC08GP8AMFB
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MC68HC08GP8A
Data Sheet
MOTOROLA
Low-Voltage Inhibit (LVI)
109
Data Sheet — MC68HC08GP8A
Section 10. Low-Voltage Inhibit (LVI)
10.1 Introduction
This section describes the low-voltage inhibit (LVI) module, which monitors the
voltage on the VDD pin and can force a reset when the VDD voltage falls below the
LVI trip falling voltage, VTRIPF.
10.2 Features
Features of the LVI module include:
Programmable LVI reset
Selectable LVI trip voltage
Programmable stop mode operation
10.3 Functional Description
Figure 10-1 shows the structure of the LVI module. The LVI is enabled out of reset.
The LVI module contains a bandgap reference circuit and comparator. Clearing the
LVI power disable bit, LVIPWRD, enables the LVI to monitor VDD voltage. Clearing
the LVI reset disable bit, LVIRSTD, enables the LVI module to generate a reset
when VDD falls below a voltage, VTRIPF. Setting the LVI enable in stop mode bit,
LVISTOP, enables the LVI to operate in stop mode. Setting the LVI 5-V or 3-V trip
point bit, LVI5OR3, enables the trip point voltage, VTRIPF, to be configured for
5-V operation. Clearing the LVI5OR3 bit enables the trip point voltage, VTRIPF, to
be configured for 3-V operation. The actual trip points are shown in Section 20.
LVISTOP, LVIPWRD, LVI5OR3, and LVIRSTD are in the mask option register
(MOR1). See 11.2 Mask Option Registers for details of the LVI’s configuration
bits. Once an LVI reset occurs, the MCU remains in reset until VDD rises above a
voltage, VTRIPR, which causes the MCU to exit reset. See 15.3.2.5 Low-Voltage
Inhibit (LVI) Reset for details of the interaction between the SIM and the LVI. The
output of the comparator controls the state of the LVIOUT flag in the LVI status
register (LVISR).
An LVI reset also drives the RST pin low to provide low-voltage protection to
external peripheral devices.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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