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| 型號(hào)： | MC68HC908QT2CPE |
| 廠(chǎng)商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 185/192頁(yè) |
| 文件大?。?/td> | 3607K |
| 代理商： | MC68HC908QT2CPE |
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Low-Voltage Inhibit (LVI)
Data Sheet
MC68HC908QY/QT Family — Rev. 3
92
Low-Voltage Inhibit (LVI)
MOTOROLA
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, VTRIPF. Setting
the LVI enable in stop mode bit, LVISTOP, enables the LVI to operate in stop
mode. Setting the LVI 5-V or 3-V trip point bit, LVI5OR3, enables the trip point
voltage, VTRIPF, to be configured for 5-V operation. Clearing the LVI5OR3 bit
enables the trip point voltage, VTRIPF, to be configured for 3-V operation. The
actual trip thresholds are specified in 16.5 5-V DC Electrical Characteristics and
NOTE:
After a power-on reset, the LVI’s default mode of operation is 3 volts. If a 5-V
system is used, the user must set the LVI5OR3 bit to raise the trip point to 5-V
operation.
If the user requires 5-V mode and sets the LVI5OR3 bit after power-on reset while
the VDD supply is not above the VTRIPR for 5-V mode, the microcontroller unit
(MCU) will immediately go into reset. The next time the LVI releases the reset, the
supply will be above the VTRIPR for 5-V mode.
Once an LVI reset occurs, the MCU remains in reset until VDD rises above a
Integration Module (SIM) for the reset recovery sequence.
The output of the comparator controls the state of the LVIOUT flag in the LVI status
register (LVISR) and can be used for polling LVI operation when the LVI reset is
disabled.
10.3.1 Polled LVI Operation
In applications that can operate at VDD levels below the VTRIPF level, software can
monitor VDD by polling the LVIOUT bit. In the configuration register, the LVIPWRD
bit must be cleared to enable the LVI module, and the LVIRSTD bit must be at set
to disable LVI resets.
10.3.2 Forced Reset Operation
In applications that require VDD to remain above the VTRIPF level, enabling LVI
resets allows the LVI module to reset the MCU when VDD falls below the VTRIPF
level. In the configuration register, the LVIPWRD and LVIRSTD bits must be
cleared to enable the LVI module and to enable LVI resets.
10.3.3 Voltage Hysteresis Protection
Once the LVI has triggered (by having VDD fall below VTRIPF), the LVI will maintain
a reset condition until VDD rises above the rising trip point voltage, VTRIPR. This
prevents a condition in which the MCU is continually entering and exiting reset if
VDD is approximately equal to VTRIPF. VTRIPR is greater than VTRIPF by the
hysteresis voltage, VHYS.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC908QT2MDW | 制造商:Rochester Electronics LLC 功能描述:1.5K FLASH W/ADC - Bulk |
| MC68HC908QT2MP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:MOTOROLA 功能描述: |
| MC68HC908QT2MPE | 功能描述:8位微控制器 -MCU 1.5K FLASH W/ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC68HC908QT2VDW | 制造商:Rochester Electronics LLC 功能描述: |
| MC68HC908QT2VP | 制造商:Freescale Semiconductor 功能描述:IC,MICROCONTROLLER,8-BIT,68HC08 CPU,CMOS,DIP,8PIN,PLASTIC |
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