16F690 MCLR as Input

[HenrikOlsson]

if the MCLR is tied to VDD, how come my pulldown + switch are working as it is.

Because when you configure RA3 to act as a normal input the MCLR signal is disconnected from the pin and instead connected to Vdd internally. In other words, it's not the PIN that's connected to Vdd but the MCLR-signal. Does that make sense?

if I write 0, word B, C, does it mean the address 0 and 1 will contain the word variable B and at address 2 will contain variable C (byte)

Yes.

/Henrik.

[jackberg1]

many thanks Henrik to clarify this post.

that make more sense to me now with further test, when the pin RA3
has nothing connected to it, the input is floating thus
when adding a pulldown it's state is stable.


I found from the datasheet a diagram of the MCLR input circuit, my guess is the red line indicate the path of the input configuration.