PIC16F datasheet(21/40 Pages) MICROCHIP

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Advance Information

DS41390C-page 21

PIC16F/LF182X/PIC12F/LF1822

5.0

PROGRAMMING ALGORITHMS

The PIC12F1822/16F182X devices use internal

latches to temporarily store the 14-bit words used for

programming. Refer to Table 4-2 for specific latch in

formation. The data latches allow the user to write the

program words with a single Begin Externally Timed

Programming or Begin Internally Timed Programming

command. The Load Program Data or the Load Config-

uration command is used to load a single data latch.

The data latch will hold the data until the Begin Exter-

nally Timed Programming or Begin Internally Timed

Programming command is given.

The data latches are aligned with the LSbs of the

address. The PC’s address at the time the Begin

Externally Timed Programming or Begin Internally

Timed Programming command is given will determine

which location(s) in memory are written. Writes cannot

cross the physical boundary. For example, with the

PIC16F1827, attempting to write from address 0002h-

0009h will result in data being written to 0008h-000Fh.

If more than the maximum number of data latches are

written without a Begin Externally Timed Programming

or Begin Internally Timed Programming command, the

data in the data latches will be overwritten. The

following figures show the recommended flowcharts for

programming.

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