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I am using a PIC 12F508 for a project and just want to make sure I understand the specifications in the datasheet for a logic low and a logic high.

Here's the datasheet for reference. The specs I'm using are on page 73.

The pin in question is the MCLR pin which I have set in the configuration bits as an input so it's not functioning as a reset for the micro controller.

For a logic low it says 0.15 VDD I take it that means it's a percentage of the micro controllers supply voltage (VDD) right?

So say my VDD is 3.50V so 3.50 * 0.15 = 525 millivolts. So as long as the input remains below 525 millivolts the PIC will read it as a logic low?

I take it the same would apply to a logic high 3.50 * 0.85 = 2.975V or above would be read as a logic high right?

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  • \$\begingroup\$ Note that those voltage levels only apply to Schmitt Trigger inputs. When the MCLR pin is assigned to GP3 it has standard TTL levels. \$\endgroup\$
    – Bruce Abbott
    Commented Jun 13, 2015 at 10:27

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Reset to default
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Correct on both counts. The default mathematical operation in an equation when none is given is multiplication.

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