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The 12F509

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Guide To Logic Level MOSFETs"

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The 12F509 is another device that is designed for cost reduction.  It is similar to the 16F84 (but has less RAM and no EEPROM)

If you know that you will never have to use specific peripherals (e.g. the ones on the 16F88 or 16F877 etc.) then you can put this into your design to save costs.

The advantage of this device is that it is In-Circuit-Programmable via the ICSP and it also has one peripheral so it is a useful device for simple timing applications and it has a bit more memory than the 12F508.

Note: If you use a compiler you're going to have to be very careful about RAM usage as it is extremely low.

12F509

PIC 12F509 block diagram

Diagram of the 12F509

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