mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 97

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
Low-Voltage Inhibit (LVI)
9.1 Introduction
This section describes the low-voltage inhibit (LVI) module, which monitors the voltage on the V
and can force a reset when the V
9.2 Features
Features of the LVI module include:
9.3 Functional Description
Figure 9-1
contains a bandgap reference circuit and comparator. The LVI power bit, LVIPWR, enables the LVI to
monitor V
falls below a voltage, V
V
LVIRST are in the configuration register (CONFIG). See
Freescale Semiconductor
LVRX
•
•
•
•
Programmable LVI reset
Programmable power consumption
Digital filtering of V
Selectable LVI trip voltage
and V
DD
shows the structure of the LVI module. The LVI is enabled out of reset. The LVI module
FROM LVISCR
LVHX
voltage. The LVI reset bit, LVIRST, enables the LVI module to generate a reset when V
V
DETECTOR
TRPSEL
DD
LOW V
are determined by the TRPSEL bit in the LVISCR (see
DD
LVRX
V
V
DD
DD
DD
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
> LVItrip = 0
< LVItrip = 1
, and remains at or below that level for nine or more consecutive CGMXCLK.
pin level
CPU CLOCK
Figure 9-1. LVI Module Block Diagram
ANLGTRIP
DD
FROM CONFIG
LVIPWR
voltage falls to the LVI trip voltage.
DIGITAL FILTER
V
DD
LVIOUT
Chapter 5 Configuration Register
FROM CONFIG
LVIRST
Figure
9-2). LVIPWR and
LVI RESET
(CONFIG).
DD
pin
DD
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