參數(shù)資料
型號(hào)： ST7LITE10F1M6
英文描述： FUSE PULLER/TESTERFUSE PULLER/TESTER; Depth, external:15mm; Length:60mm; Voltage rating, AC:24V; Voltage rating, DC:24V; Width, external:20mm
中文描述： ST7LITE1 - 8單電壓閃存EEPROM的MEMORY.DATA位MCU。 ADC的。 4定時(shí)器。的SPI
文件頁(yè)數(shù)： 27/122頁(yè)
文件大?。?/td> 1716K
代理商： ST7LITE10F1M6
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ST7LITE0, ST7SUPERLITE
27/122
RESET SEQUENCE MANAGER
(Cont’d)
7.4.2 Asynchronous External RESET pin
The RESET pin is both an input and an open-drain
output with integrated R
ON
weak pull-up resistor.
This pull-up has no fixed value but varies in ac-
cordance with the input voltage. It
can be pulled
low by external circuitry to reset the device. See
Electrical Characteristic section for more details.
A RESET signal originating from an external
source must have a duration of at least t
h(RSTL)in
in
order to be recognized (see
Figure 16
). This de-
tection is asynchronous and therefore the MCU
can enter reset state even in HALT mode.
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.
7.4.3 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.
7.4.4 Internal Low Voltage Detector (LVD)
RESET
Two different RESET sequences caused by the in-
ternal LVD circuitry can be distinguished:
I
Power-On RESET
I
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 16
.
The LVD filters spikes on V
DD
larger than t
g(VDD)
to
avoid parasitic resets.
7.4.5 Internal Watchdog RESET
The RESET sequence generated by a internal
Watchdog counter overflow is shown in
Figure 16
.
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 16. 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 T
CPU
)
VECTOR FETCH
ACTIVE
PHASE
ACTIVE
PHASE
1
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