User's Manual
HC864-AUTO Hardware User Guide
1vv0300946 Rev.4 – 2012-12-27
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Reserved. Page 25 of 77
4.3.3. Hardware Unconditional Restart
To unconditionally restart HC864-AUTO, the pad RESET# must be tied low for at least 200
milliseconds and then released.
A simple circuit to do it is:
For example:
NOTE:
Do not use any pull up resistor on the RESET# line or any totem pole digital output. Using
pull up resistor may bring to latch up problems on the HC864-AUTO power regulator and
improper functioning of the module. The line RESET# must be connected only in open
collector configuration.
TIP:
The unconditional hardware Restart must always be implemented on the boards and the
software must use it as an emergency exit procedure.
RESET#
Unconditional Restart
impulse
GND