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MC908QT2MFQE Datasheet(PDF) 85 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QT2MFQE
Descripción  M68HC08 Microcontrollers
Descarga  168 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QT2MFQE Datasheet(HTML) 85 Page - Freescale Semiconductor, Inc

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MC68HC908QY/QT Family Data Sheet, Rev. 6
Freescale Semiconductor
85
Chapter 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
Programmable power consumption
Selectable LVI trip voltage
Programmable stop mode operation
10.3 Functional Description
Figure 10-1 shows the structure of the LVI module. LVISTOP, LVIPWRD, LVI5OR3, and LVIRSTD are
user selectable options found in the configuration register (CONFIG1). See Chapter 5 Configuration
Register (CONFIG).
Figure 10-1. LVI Module Block Diagram
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,
LOW VDD
DETECTOR
LVIPWRD
STOP INSTRUCTION
LVISTOP
LVI RESET
LVIOUT
VDD > LVITRIP = 0
VDD ≤ LVITRIP = 1
FROM CONFIG
FROM CONFIG
VDD
FROM CONFIG
LVIRSTD
LVI5OR3
FROM CONFIG


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