MC68HC908GT16_07 FREESCALE [Freescale Semiconductor, Inc], MC68HC908GT16_07 Datasheet - Page 114

• Manufacturer Part Number: MC68HC908GT16_07
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Low-Voltage Inhibit (LVI)
LVISTOP, LVIPWRD, LVI5OR3, and LVIRSTD are in the configuration register (CONFIG1). See
4-2. Configuration Register 1 (CONFIG1)
occurs, the MCU remains in reset until V
reset. See
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.
10.3.1 Polled LVI Operation
In applications that can operate at V
the LVIOUT bit. In the configuration register, the LVIPWRD bit must be at 0 to enable the LVI module, and
the LVIRSTD bit must be at 1 to disable LVI resets.
10.3.2 Forced Reset Operation
In applications that require V
module to reset the MCU when V
LVIPWRD and LVIRSTD bits must be at 0 to enable the LVI module and to enable LVI resets.
10.3.3 Voltage Hysteresis Protection
Once the LVI has triggered (by having V
V
114
$FE0C
Addr.
DD
rises above the rising trip point voltage, V
15.3.2.5 Low-Voltage Inhibit (LVI) Reset
Register Name
LVI Status Register
See page 115.
FROM CONFIG1
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
(LVISR)
DETECTOR
LOW V
LVI5OR3
V
DD
DD
Reset:
Read:
Write:
DD
Figure 10-1. LVI Module Block Diagram
Figure 10-2. LVI I/O Register Summary
to remain above the V
V
V
DD
DD
DD
FROM CONFIG
LVIOUT
> LVI
≤ LVI
DD
Bit 7
LVIPWRD
falls below the V
0
Trip
Trip
levels below the V
DD
DD
= 0
= 1
for details of the LVI’s configuration bits. Once an LVI reset
= Unimplemented
fall below V
rises above a voltage, V
6
0
0
TRIPR
LVIOUT
for details of the interaction between the SIM and the
. This prevents a condition in which the MCU is
TRIPF
TRIPF
TRIPF
STOP INSTRUCTION
5
0
0
FROM CONFIG1
TRIPF
level. In the configuration register, the
LVIRSTD
), the LVI will maintain a reset condition until
level, enabling LVI resets allows the LVI
level, software can monitor V
4
0
0
TRIPR
3
0
0
, which causes the MCU to exit
FROM CONFIG1
LVISTOP
LVI RESET
2
0
0
Freescale Semiconductor
1
0
0
DD
by polling
Figure
Bit 0
0
0