M PIC16C62X/PIC16CE62X→PIC16F62X Migration DEVICE MIGRATIONS This document is intended to describe the functional differences and the electrical specification differences that are present when migrating from one device to the next. Note: This device has been designed to perform to the parameters of its data sheet. It has been tested to an electrical specification designed to determine its conformance with these parameters. Due to process differences in the manufacture of this device, this device may have different performance characteristics than its earlier version. These differences may cause this device to perform differently in your application than the earlier version of this device. Table 1 shows the considerations that must be taken into account when migrating from the PIC16C62X/PIC16CE62X to the PIC16F62X. TABLE 1: PIC16C62X/PIC16CE62X → PIC16F62X MIGRATION DIFFERENCES Functional Differences No. Difference H/W S/W Prog. — 1 RC mode is now ER mode 2 EEPROM is not I2C™ — TABLE 2: PIC16C62X/PIC16CE62X — → PIC16F62X NEW FEATURES No. Feature 1 Program memory is FLASH 2 Internal 4 MHz and 37 kHz RC 3 Hardware USART 4 16-bit Timer1 5 8-bit auto reload Timer2 6 Capture, Compare, PWM Module 7 Internal MCLR 2002 Microchip Technology Inc. DS41169C-page 1 DEVICE MIGRATIONS New I/O Pins The PIC16F627 and PIC16F628 are the latest additions to the PIC16C62X/PIC16CE62X family of 18-pin parts with comparators. These new parts greatly increase the available features with the addition of many new peripherals. Some of these changes 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 FLASH parts. The addition of the INTRC modes frees up two more pins. OSC1 and OSC2 can be configured as RA6 and RA7 for general purpose I/O. Additionally, RA6 can be used to bring the INTRC clock external. Consult the PIC16F62X Data Sheet (DS40300) for details. HARDWARE CHANGES FLASH Memory This change will not affect many applications, but it does provide some simple opportunities for improvements. With very little effort, a design can be made incircuit reprogrammable. RC MODE IS NOW ER MODE The biggest difference between the PIC16C62X/ PIC16CE62X and the PIC16F62X would be the removal of the RC Oscillator mode. This has been changed to an External Resistor (ER) mode. In most cases, a design can switch from RC to ER, simply by removing the capacitor and changing the value of the resistor to provide the same clock speed. In cases where 37 kHz or 4 MHz is desired or acceptable, the external RC can be eliminated entirely and the internal RC modes can be used. Process Differences Because the PIC16F62X family is made on a FLASH process, there will be subtle behavior differences between the PIC16F62X and the PIC16C62X parts. The most visible difference will be in power consumption. Before starting on a design migration, check the data sheets and verify that the power consumption of the new parts is appropriate for your application. ICSPTM Programming The PIC16F62X family includes provisions for ICSP. The ICSP algorithms are very similar to the algorithms in the PIC16C62X/PIC16CE62X devices. The primary difference is the ability to program the EEPROM and to erase the memory. This eliminates the requirement of special code to initialize the EEPROM memory at run time. It also allows test code to be programmed and then replaced with product code, due to the rewriteable nature of the FLASH memory. The PIC16F62X also includes a Low Voltage Programming mode (LVP) that allows the device to be programmed from a 5V power supply. Using LVP places restrictions on pin RB4. Consult the data sheet for details. SOFTWARE CHANGES INTRC IS A NEW MODE This part has two internal RC Oscillator modes. The first mode, enabled by a CONFIG bit, is the 4 MHz mode (INTRC). The second is a 37 kHz mode that is software selectable when the part is in ER or INTRC. This allows designs to switch between a High Speed, High Power mode and a Low Speed, Low Power mode, as desired. The 37 kHz oscillator is not available when the configuration register is set for HS, XT or LP modes. Internal MCLR The MCLR pin can now be disabled. This removes the possibility of externally resetting the CPU, but it can provide an additional I/O pin. If you do not use the pin, it is still recommended that you tie the pin high or low with a resistor. When MCLR is disabled, RA5 becomes available as a Schmitt trigger input. DS41169C-page 2 EEPROM is No Longer Accessed With I2CTM The PIC16CE62X family provides a valuable EEPROM resource that is important for many applications. This EEPROM was implemented by placing a second DIE alongside the PICmicro® DIE. The communications were handled with firmware that provided I2C communications. The FLASH process used in the PIC16F62X family allows the EEPROM cells to be integrated on the same DIE as the PICmicro DIE. This integration includes circuitry to perform the EEPROM read and write cycles. Consult the data sheets for the new routines for accessing the EEPROM. 2002 Microchip Technology Inc. NEW FEATURES The PIC16F62X has new hardware features that some applications may be able to move from software. These features include: 1. 2. 3. 4. 5. 6. Hardware USART. 16-bit Timer 1 with LP oscillator driver. 8-bit auto-reload Timer 2. Capture, Compare PWM (CCP) module. 10-bit PWM output. Internal RC oscillator at 4 MHz and 37 kHz. CONCLUSION The PIC16F62X family is a valuable addition to the 18-pin comparator family of parts. With the addition of a UART, new timers, CCP, PWM and internal RC, a wider range of applications becomes possible. With only minimal hardware/software changes, many existing PIC16C62X designs can be migrated to take advantage of FLASH memory and a newer process. 2002 Microchip Technology Inc. DS41169C-page 3 NOTES: DS41169C-page 4 2002 Microchip Technology Inc. Note the following details of the code protection feature on PICmicro® MCUs. • • • • • • The PICmicro family meets the specifications contained in the Microchip Data Sheet. Microchip believes that its family of PICmicro microcontrollers is one of the most secure products of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the PICmicro microcontroller in a manner outside the operating specifications contained in the data sheet. The person doing so may be engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable”. Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our product. If you have any further questions about this matter, please contact the local sales office nearest to you. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Term Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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