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參數(shù)資料
| 型號： | ST63E69D1 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8-BIT HCMOS MCU FOR DIGITAL CONTROLLED MULTI FREQUENCYMONITOR |
| 中文描述： | 8位HCMOS單片機的數(shù)控多FREQUENCYMONITOR |
| 文件頁數(shù)： | 23/71頁 |
| 文件大?。?/td> | 584K |
| 代理商： | ST63E69D1 |
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VA000200
TO ST6
RESET
ST6
INTERNAL RESET
OSCILLATOR
SIGNAL
WATCHDOG RESET
V
DD
300k
RESET
(ACTIVE LOW)
COUNTER
1.0k
Figure20. InternalReset Circuit
RESET
The ST6369 devices can be reset in two ways: by
theexternalresetinput (RESET) tiedlow andbythe
hardwareactivateddigital watchdogperipheral.
RESETInput
The externalactivelowreset pinisusedto resetthe
ST6369 devices and provide an orderly software
startup procedure. The activation of the Reset pin
may occur at any time in the RUN or WAITmode.
Even short pulsesat the reset pin will be accepted
sincethe resetsignalislatchedinternallyandisonly
cleared after 2048 clocks at the oscillator pin. The
clocks from the oscillator pin to the reset circuitry
are bufferedbya schmitttriggersothatan oscillator
in start-upconditions will not give spurious clocks.
When the reset pin is held low, the external crystal
oscillator is also disabled in order to reduce current
consumption. The MCU is configured in the Reset
modeas long asthe signalof the RESET pinis low.
The processing of the program is stopped and the
standardInput/Outputports(portA, port B andport
C) are inthe input state.As soon as the levelon the
resetpinbecomeshigh,theinitializationsequenceis
executed.Refer to the MCU initialization sequence
foradditionalinformation.
Watchdog Reset
The ST6369 devices are provided with an 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 externalresistorbetween V
DD
and the 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.
ST6369
19/67
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