DS41222A-page 2

Preliminary

 2003 Microchip Technology Inc.

DEVICE MIGRATIONS

The PIC16F505 is mainly a technology process change

from the PIC16C505 14-pin parts. There are some

changes that may affect older designs looking to use

the new parts. The changes are grouped into two

categories: those that affect hardware and those that

affect software. In most cases, an older design will

have little or no problems migrating to these new parts.

HARDWARE CHANGES

Oscillator

EC Oscillator mode has been added to the device. This

saves the cost of a dedicated clock source when a

system-wide clock source is available.

Operating Region

The commercial temperature operating region has

been incorporated into the industrial temperature

region. Please see the voltage frequency graphs in the

data sheet for more information.

The “LF” operating region has been incorporated into

the “F” parts. Please see the voltage frequency graphs

in the data sheet for more information.

Process Differences

Because the PIC16F505 uses a newer process

technology, there will be subtle behavior differences

between the PIC16C505 and the PIC16F505. Before

starting on a design migration, check the data sheets

and verify that the electrical specifications for the new

part are appropriate for your application.

SOFTWARE CHANGES

Flash Program Memory Code Protection

The Code Protect bits for the program memory have

changed from the PIC16C505 to the PIC16F505.

Configuration

bits

<11:6>

(CP)

are

now

unimplemented. They have been replaced with one

Configuration bit <3> (CP).

OSCCAL

An extra bit has been implemented in the 4 MHz

INTOSC enhancing the calibrated frequency of the

INTOSC.

The factory calibration value stored at location 03FFh

has also been increased by one bit and is loaded in the

same manner as the PIC16C505 with a MOVLW,

OSCCAL

instruction.