MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 423

• Manufacturer Part Number: MC68HC908LK24
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
NOTE:
The LVI trip point selection bits, LVISEL[1:0], select the trip point
voltage, V
points are shown in
Setting LVI interrupt enable bit, LVIIE, enables LVI interrupts whenever
the LVIOUT bit toggles (from logic 0 to logic 1, or from logic 1 to logic 0).
After a power-on reset (POR) the LVI’s default mode of operation is 3V.
If a 5V system is used, the user must modified the LVISEL[1:0] bits to
raise the trip point to 5V operation. Note that this must be done after
every power-on reset since the default will revert back to 3V mode after
each power-on reset. If the V
when POR is released, the MCU will immediately go into reset. The LVI
in this case will hold the MCU in reset until either V
rising 3V trip point, V
approximately 0V which will re-trigger the power-on reset.
LVISTOP, LVIPWRD, LVIRSTD, and LVISEL[1:0] are in the
configuration registers. See
(CONFIG)
occurs, the MCU remains in reset until V
V
Inhibit (LVI) Reset
LVI. The output of the comparator controls the state of the LVIOUT flag
in the LVI status register (LVISR). The LVIIE, LVIIF, and LVIIACK bits in
the LVISR control LVI interrupt functions.
An LVI reset also drives the RST pin low to provide low-voltage
protection to external peripheral devices.
TRIPR
Freescale Semiconductor, Inc.
For More Information On This Product,
, which causes the MCU to exit reset. See
TRIPF
for details of the LVI’s configuration bits. Once an LVI reset
Go to: www.freescale.com
Low-Voltage Inhibit (LVI)
, to be configured for 5V or 3V operation. The actual trip
for details of the interaction between the SIM and the
Section 24. Electrical
TRIPR
, which will release reset or V
Section 5. Configuration Registers
DD
supply is below the 3V mode trip voltage
DD
Specifications.
rises above a voltage,
9.4.2.5 Low-Voltage
Low-Voltage Inhibit (LVI)
DD
Functional Description
goes above the
DD
decreases to
Data Sheet
423