st10f269z1 STMicroelectronics, st10f269z1 Datasheet - Page 119
st10f269z1
Manufacturer Part Number
st10f269z1
Description
St10f269 16-bit Mcu With Mac Unit, 256k Byte Flash Memory And 12k Byte Ram
Manufacturer
STMicroelectronics
Datasheet
1.ST10F269Z1.pdf
(184 pages)
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ST10F269
Depending on the delay of the next applied reset,
the MCU can enter a synchronous reset or an
asynchronous reset. If RPD pin is below 2.5V an
asynchronous reset starts, if RPD pin is above
2.5V a synchronous reset starts. (See Section
18.1 - and Section 18.2 -).
Note that an internal pull-down is connected to
RPD pin and can drive a 100 A to 200 A current.
This Pull-down is turned on when RSTIN pin is
low.
To properly use the bidirectional reset features,
the schematic (or equivalent) of Figure 60 must be
implemented. R1-C1 only work for power-on or
manual reset in the same way as explained
previously. D1 diode brings a faster discharge of
Figure 58 : Internal (simplified) Reset Circuitry.
Internal
Reset
Signal
EINIT Instruction
Reset State
Machine
Clock
Clr
Trigger
Asynchronous
Reset
Reset Sequence
(512 CPU Clock Cycles)
Set
Clr
From/to Exit
Powerdown
Circuit
Q
SRST instruction
watchdog overflow
C1 capacitor at power-off during repetitive
switch-on / switch-off sequences. D2 diode
performs an OR-wired connection, it can be
replaced with an open drain buffer. R2 resistor
may be added to increase the pull-up current to
the open drain in order to get a faster rise time on
RSTIN pin when bidirectional function is activated.
The start-up configurations and some system
features are selected on reset sequences as
described in Table 38 and Table 39.
Table 38
configuration latched on PORT0 in the five
different reset ways. Table 39 summarizes the
state of bits of PORT0 latched in RP0H,
SYSCON, BUSCON0 registers.
BDRSTEN
describes
what
18 - SYSTEM RESET
V
V
DD
DD
Weak pull-down
(~200 A)
is
RSTOUT
the
RSTIN
RPD
system
119/184
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