參數(shù)資料
型號： ST7DALI
廠商： 意法半導(dǎo)體
元件分類： ADC
英文描述： 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI, DALI
中文描述： 8位單電壓閃存存儲器，數(shù)據(jù)EEPROM，模數(shù)轉(zhuǎn)換器，定時器，SPI和大理微控制器
文件頁數(shù)： 28/141頁
文件大?。?/td> 2175K
代理商： ST7DALI
ST7DALI
28/141
1
RESET SEQUENCE MANAGER
(Cont’d)
The RESET pin is an asynchronous signal which
plays a major role in EMS performance. In a noisy
environment, it is recommended to follow the
guidelines mentioned in the electrical characteris-
tics section.
7.5.3 External Power-On RESET
If the LVD is disabled by option byte, to start up the
microcontroller correctly, the user must ensure by
means of an external reset circuit that the reset
signal is held low until V
DD
is over the minimum
level specified for the selected f
OSC
frequency.
A proper reset signal for a slow rising V
DD
supply
can generally be provided by an external RC net-
work connected to the RESET pin.
7.5.4 Internal Low Voltage Detector (LVD)
RESET
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
■
Power-On RESET
■
Voltage Drop RESET
The device RESET pin acts as an output that is
pulled low when V
DD
<V
IT+
(rising edge) or
V
DD
<V
IT-
(falling edge) as shown in
Figure 15
.
The LVD filters spikes on V
DD
larger than t
g(VDD)
to
avoid parasitic resets.
7.5.5 Internal Watchdog RESET
The RESET sequence generated by a internal
Watchdog counter overflow is shown in
Figure 15
.
Starting from the Watchdog counter underflow, the
device RESET pin acts as an output that is pulled
low during at least t
w(RSTL)out
.
Figure 15. RESET Sequences
V
DD
RUN
RESET PIN
EXTERNAL
RESET
SOURCE
WATCHDOG
RESET
ACTIVE PHASE
V
IT+(LVD)
V
IT-(LVD)
t
h(RSTL)in
RUN
WATCHDOG UNDERFLOW
t
w(RSTL)out
RUN
RUN
EXTERNAL
RESET
LVD
RESET
WATCHDOG
RESET
INTERNAL RESET (256 or 4096 T
CPU
)
VECTOR FETCH
ACTIVE
PHASE
ACTIVE
PHASE
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