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ST72411R датащи(PDF) 19 Page - STMicroelectronics

номер детали ST72411R
подробное описание детали  8-BIT MCU WITH SMARTCARD INTERFACE, LCD DRIVER, 8-BIT TIMER, SAFE RESET AND SUPPLY MONITORING
PDF  71 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72411R датащи(HTML) 19 Page - STMicroelectronics

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ST72411R
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RESET MANAGER (Cont’d)
([ W
HUQDO5( 6 ( 7 SLQ
The RESET pin is both an input and an open-drain
output with integrated RON weak pull-up resistor
(see Figure 11). This pull-up has no fixed value but
varies in accordance with the input voltage. It can
be pulled low by external circuitry to reset the de-
vice.
A RESET signal coming from an external source
must have a duration of at least tPULSE in order to
be recognized. Two RESET sequences can be as-
sociated with this RESET source as shown in Fig-
ure 12.
When the RESET is generated by an internal
source, during the two first phases of the RESET
sequence, the device RESET pin acts as an out-
put that is pulled low.
Figure 12. External RESET Sequence with internal Clock Selected (OSC_SEL pin tied to VSS)
Figure 13. External RESET Sequence with External Clock Selected (OSC_SEL pin tied to VDD)
5( 6 ( 7
58 1
INTERNAL RESET
4096 CLOCK CYCLES
FETCH
VECTOR
58 1
tPULSE
9 ’’
VIT+
VDD nominal
DELAY
RESET PIN
EXTERNAL
RESET SOURCE
5( 6 ( 7
58 1
INTERNAL RESET
260 CLOCK
FETCH
VECTOR
58 1
tPULSE
9 ’’
VIT+
VDD nominal
DELAY
LVDS,
ON
OFF
OPSD,
PSS
4096 CLOCK CYCLES
CYCLES
ON
RESET PIN
EXTERNAL
RESET SOURCE



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