READCODE and WRITECODE for a PIC16F727

[ScaleRobotics]

Some of the 16F's do, but not your 16F727. Look for something like this in the data sheet:

• Self-Programmability: These devices can write to
their own program memory spaces under internal
software control. By using a bootloader routine,
located in the protected Boot Block at the top of
program memory, it becomes possible to create an
application that can update itself in the field.

You can also use the old MAPS utility, and highlight your chip, and look at the Self Write Flash option to see if there is a yes by it: