參數(shù)資料
型號(hào)： ST6395B1
廠商： 意法半導(dǎo)體
英文描述： 8-BIT HCMOS MCUs FOR TV FREQUENCY SYNTHESIS WITH OSD
中文描述： 8位微控制器HCMOS電視頻率合成帶OSD
文件頁(yè)數(shù)： 25/68頁(yè)
文件大?。?/td> 560K
代理商： ST6395B1
VA000200
TO ST6
RESET
ST6
INTERNAL RESET
OSCILLATOR
SIGNAL
WATCHDOG RESET
V
DD
300k
RESET
(ACTIVE LOW)
COUNTER
1.0k
Figure22. InternalReset Circuit
RESET
TheST639xdevicescanberesetintwoways:bythe
external reset input (RESET) tied low and by the
hardwareactivateddigital watchdogperipheral.
RESETInput
The external activelow reset pin is usedto reset the
ST638x devices and provide an orderly software
startup procedure. The activation of the Reset pin
may occur at any time in the RUN or WAIT mode.
Even short pulses at the reset pin will be accepted
sincetheresetsignal islatchedinternallyandis only
cleared after 2048 clocks at the oscillator pin. The
clocksfrom theoscillatorpinto theresetcircuitry are
buffered by a schmitt trigger so that an oscillator in
start-up conditions will not give spurious clocks.
Whenthereset pinisheldlow,theexternalcrystalos-
cillatorisalso disabledin orderto reducecurrentcon-
sumption.TheMCU is configuredin theResetmode
as long as the signal of the RESET pin is low. The
processingoftheprogramisstoppedandthestandard
Input/Outputports(portA,portBandportC)areinthe
inputstate.As soon asthe level on the reset pin be-
comes high, the initialization sequence is executed.
RefertotheMCU initializationsequencefor additional
information.
Watchdog Reset
The ST639x devices are provided withan on-chip
hardware activateddigital watchdog function inor-
der to providea graceful recovery from a software
upset.Ifthe watchdogregisteris notrefreshedand
the end-of-count is reached, then the reset state
will be latched into the MCU and an internal circuit
pulls down the reset pin. This also resets the
watchdog which subsequently turns off the pull-
down and activates the pull-up device at the reset
pin. This causesthe positive transition at the reset
pin. The MCU will then exit the reset state after
2048 clocks on the oscillator pin.
Application Notes
An external resistorbetweenV
DD
andthe reset pin
is not required because an internal pull-up device
is provided.Theusermay preferto addan external
pull-up resistor.
An internal Power-on device does not guarantee
that the MCU will exit the reset state when V
DD
is
above 4.5V and therefore the RESET pin should
be externallycontrolled.
ST6391,92,93,95,97,99
21/64
相關(guān)PDF資料
PDF描述
ST6391B1 MOSFET; Transistor Polarity:Dual N Channel; Continuous Drain Current, Id:2.6A; On-Resistance, Rds(on):0.18ohm; Package/Case:8-SOIC; Leaded Process Compatible:No; Mounting Type:surface mount; Peak Reflow Compatible (260 C):No
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