MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 330

no-image

MC68HC708XL36

Manufacturer Part Number
MC68HC708XL36
Description
HCMOS Microcontroller Unit
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
LVI
Functional Description
Polled LVI
Operation
MC68HC708XL36
330
Figure 1 shows the structure of the LVI module. The LVI module
contains a bandgap reference circuit and comparator. Clearing the LVI
power disable bit, LVIPWRD, enables the LVI to monitor V
Clearing the LVI reset disable bit, LVIRSTD, enables the LVI module to
generate a reset when V
enable in stop mode bit, LVISTOP, enables the LVI to operate in stop
mode. LVIPWRD, LVIRSTD, and LVISTOP are in the configuration
register.
Once an LVI reset occurs, the MCU remains in reset until V
above a voltage, V
reaches V
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.
In applications that can operate at V
software can monitor V
register, the LVIPWRD bit must be at logic 0 to enable the LVI module,
and the LVIRSTD bit must be at logic 1 to disable LVI resets.
Freescale Semiconductor, Inc.
For More Information On This Product,
DETECTOR
LOW V
LVR
V
DD
DD
Go to: www.freescale.com
+ H
Figure 1. LVI Module Block Diagram
LVR
V
V
LVR
DD
DD
FROM CONFIG
> LVI
.The output of the comparator controls the state of
LVI
LVIPWRD
LVI
+ H
DD
Trip
Trip
DD
= 0
by polling the LVIOUT bit. In the configuration
= 1
LVR
falls below a voltage, V
. A power-on reset occurs when V
LVIOUT
DD
STOP INSTRUCTION
levels below the V
FROM CONFIG
LVIRSTD
LVR
. Setting the LVI
FROM CONFIG
LVR
DD
LVI RESET
LVISTOP
DD
MOTOROLA
voltage.
level,
rises
2-lvim2p7_a
DD

Related parts for MC68HC708XL36