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TC1232CUA データシート(PDF) 8 Page - Microchip Technology

部品番号 TC1232CUA
部品情報  Microprocessor Monitor
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ホームページ  http://www.microchip.com
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TC1232CUA データシート(HTML) 8 Page - Microchip Technology

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TC1232
DS20001370E-page 8
 2002-2014 Microchip Technology Inc.
4.2
Push Button Reset Input
The debounced manual Reset input (PB RST) manu-
ally forces the Reset outputs into their active states.
Figure 4-5 shows a block diagram for using the
TC1232 with a push button switch.
Once PB RST has been low for a time tPBD (the push
button delay time), the Reset outputs go active. The
Reset outputs remain in their active states for a
minimum of 250 ms after PB RST rises above VIH.
Figure 4-6 shows a waveform for the push button
switch input and the Reset pins output.
A mechanical push button or active logic signal can
drive the PB RST input. The debounced input ignores
input pulses less than 1 ms and recognizes pulses of
20 ms or greater. No external pull-up resistor is
required because the PB RST input has an internal
pull-up to VCC of approximately 100 µA.
FIGURE 4-5:
Push Button Reset and
Watchdog Timer.
FIGURE 4-6:
Push Button Reset –
PB RST Input.
VCC
TOL
PB RST
GND
RST
ST
I/O
Reset
+5V
TC1232
TD
Microprocessor
RST
VIL
tPB
RST
tPBD
VIH
tRST
PB RST
The debounced PB RST input ignores input pulses less
than 1 ms and is designed to recognize pulses of
20 ms or greater.


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