sa aking kaalaman na idinagdag ni William Richardson ang designer at owner ng blueroomelectronics mas accurate daw ang built in clock nya at mas mura din
F628 walang built in clock?
medyo mahirap din masagot ang tanong mo pareng yus, talagang datasheet ang makakasagot nyan
The part with the suffix "A" is a new CMOS version, and is easy to manufacture resulting in a cheaper price and are also more enhance than the part without the "A" suffix. For example the PIC16f84 can function up to 10MHZ whilst the "A" version up to 20MHz. You can also consult some migration documents.