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参数资料
| 型号： | ST72311N2T3/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封装： | PLASTIC, TQFP-64 |
| 文件页数： | 10/92页 |
| 文件大小： | 624K |
| 代理商： | ST72311N2T3/XXX |
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ST72311
RESET (Cont’d)
3.2.4 Low Voltage Detector Reset
The on-chip Low Voltage Detector (LVD) gener-
ates a static reset when the supply voltage is be-
low a reference value. The LVD functions both
during power-on as well as when the power supply
drops (brown-out). The reference value for a volt-
age drop is lower than the reference value for pow-
er-on in order to avoid a parasitic reset when the
MCU starts running and sinks current on the sup-
ply (hysteresis).
The LVD Reset circuitry generates a reset when
VDD is below:
VLVDUP when VDD is rising
VLVDDOWN when VDD is falling
Provided the minimun VDD value (guaranteed for
the oscillator frequency) is above VLVDDOWN , the
MCU can only be in two modes:
- under full software control or
- in static safe reset
In this condition, secure operation is always en-
sured for the application without the need for ex-
ternal reset hardware.
During a Low Voltage Detector Reset, the RESET
pin is held low, thus permitting the MCU to reset
other devices.
In noisy environments, the power supply may drop
for short periods and cause the Low Voltage De-
tector to generate a Reset too frequently. In such
cases, it is recommended to use devices without
the LVD Reset option and to rely on the watchdog
function to detect application runaway conditions.
Figure 13. Low Voltage Detector Reset Function
Figure 14. Low Voltage Detector Reset Signal
Note: See electrical characteristics for values of
VLVDUP and VLVDDOWN
Figure 15. Temporization timing diagram after an internal Reset
LOW VOLTAGE
DETECTOR RESET
VDD
FROM
WATCHDOG
RESET
VDD
VLVDUP
VLVDDOWN
VDD
Addresses
$FFFE
Temporization (4096 CPU clock cycles)
VLVDUP
18
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相关代理商/技术参数 |
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|---|---|
| ST72311N2T6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
| ST72311N2T6/XXX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST72311N2T6S | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
| ST72311N4 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
| ST72311N4B1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS |
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