In SX Microcontrollers, SX/B Compiler and SX-Key Tool, peterverkaik wrote:

Hi,
In the attached schematic is an auto reset circuitry.

The idea is to let an SX28 I/O pin reset both a stamp and the SX28.

What I would like to know:

 

is there a minimal hold time for the stamp reset input?

is the C1 cap necessary to create this hold time?

is the R2 value too large? R2 protects the SX28 I/O pin.

 

When the SX28 I/O gets a low output, the reset line will go low (discharge C1)

but then the SX28 resets, so the SX28 I/O pin will revert to an input (charge C1)

 

Comments please.

regards peter

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