? 2002 microchip technology inc. ds41169c-page 1 m 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. table 1 shows the considerations that must be taken into account when migrating from the pic16c62x/pic16ce62x to the pic16f62x. note: this device has been designed to perform to the parameters of its data sheet. it has been tested to an elec- trical specification designed to determine its conformance with these parameters. due to process differ- ences 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: 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 i 2 c ? ? ? 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 416-bit timer1 5 8-bit auto reload timer2 6 capture, compare, pwm module 7 internal mclr pic16c62x/pic16ce62x pic16f62x migration
ds41169c-page 2 ? 2002 microchip technology inc. device migrations the pic16f627 and pic16f628 are the latest addi- tions 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. hardware changes flash memory this change will not affect many applications, but it does provide some simple opportunities for improve- ments. with very little effort, a design can be made in- circuit 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. 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. new i/o pins 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. 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 consump- tion. 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. icsp tm 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. con- sult the data sheet for details. software changes eeprom is no longer accessed with i 2 c tm 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 i 2 c commu- nications. 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 cir- cuitry to perform the eeprom read and write cycles. consult the data sheets for the new routines for accessing the eeprom.
? 2002 microchip technology inc. ds41169c-page 3 new features the pic16f62x has new hardware features that some applications may be able to move from software. these features include: 1. hardware usart. 2. 16-bit timer 1 with lp oscillator driver. 3. 8-bit auto-reload timer 2. 4. capture, compare pwm (ccp) module. 5. 10-bit pwm output. 6. 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 exist- ing pic16c62x designs can be migrated to take advantage of flash memory and a newer process.
ds41169c-page 4 ? 2002 microchip technology inc. notes:
? 2002 microchip technology inc. ds41169c - page 5 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 com- ponents in life support systems is not authorized except with express written approval by microchip. no licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. trademarks the microchip name and logo, the microchip logo, filterlab, k ee l oq , 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. microchip received qs-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona in july 1999. the company?s quality system processes and procedures are qs-9000 compliant for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms and microperipheral products. in addition, microchip ? s quality system for the design and manufacture of development systems is iso 9001 certified. 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 to day, 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 knowl - edge, 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.
ds41169c-page 6 ? 2002 microchip technology inc. m americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: 480-792-7627 web address: http://www.microchip.com rocky mountain 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7966 fax: 480-792-7456 atlanta 500 sugar mill road, suite 200b atlanta, ga 30350 tel: 770-640-0034 fax: 770-640-0307 boston 2 lan drive, suite 120 westford, ma 01886 tel: 978-692-3848 fax: 978-692-3821 chicago 333 pierce road, suite 180 itasca, il 60143 tel: 630-285-0071 fax: 630-285-0075 dallas 4570 westgrove drive, suite 160 addison, tx 75001 tel: 972-818-7423 fax: 972-818-2924 detroit tri-atria office building 32255 northwestern highway, suite 190 farmington hills, mi 48334 tel: 248-538-2250 fax: 248-538-2260 kokomo 2767 s. albright road kokomo, indiana 46902 tel: 765-864-8360 fax: 765-864-8387 los angeles 18201 von karman, suite 1090 irvine, ca 92612 tel: 949-263-1888 fax: 949-263-1338 new york 150 motor parkway, suite 202 hauppauge, ny 11788 tel: 631-273-5305 fax: 631-273-5335 san jose microchip technology inc. 2107 north first street, suite 590 san jose, ca 95131 tel: 408-436-7950 fax: 408-436-7955 toronto 6285 northam drive, suite 108 mississauga, ontario l4v 1x5, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific australia microchip technology australia pty ltd suite 22, 41 rawson street epping 2121, nsw australia tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing microchip technology consulting (shanghai) co., ltd., beijing liaison office unit 915 bei hai wan tai bldg. no. 6 chaoyangmen beidajie beijing, 100027, no. china tel: 86-10-85282100 fax: 86-10-85282104 china - chengdu microchip technology consulting (shanghai) co., ltd., chengdu liaison office rm. 2401, 24th floor, ming xing financial tower no. 88 tidu street chengdu 610016, china tel: 86-28-6766200 fax: 86-28-6766599 china - fuzhou microchip technology consulting (shanghai) co., ltd., fuzhou liaison office unit 28f, world trade plaza no. 71 wusi road fuzhou 350001, china tel: 86-591-7503506 fax: 86-591-7503521 china - shanghai microchip technology consulting (shanghai) co., ltd. room 701, bldg. b far east international plaza no. 317 xian xia road shanghai, 200051 tel: 86-21-6275-5700 fax: 86-21-6275-5060 china - shenzhen microchip technology consulting (shanghai) co., ltd., shenzhen liaison office rm. 1315, 13/f, shenzhen kerry centre, renminnan lu shenzhen 518001, china tel: 86-755-2350361 fax: 86-755-2366086 hong kong microchip technology hongkong ltd. unit 901-6, tower 2, metroplaza 223 hing fong road kwai fong, n.t., hong kong tel: 852-2401-1200 fax: 852-2401-3431 india microchip technology inc. india liaison office divyasree chambers 1 floor, wing a (a3/a4) no. 11, o ? shaugnessey road bangalore, 560 025, india tel: 91-80-2290061 fax: 91-80-2290062 japan microchip technology japan k.k. benex s-1 6f 3-18-20, shinyokohama kohoku-ku, yokohama-shi kanagawa, 222-0033, japan tel: 81-45-471- 6166 fax: 81-45-471-6122 korea microchip technology korea 168-1, youngbo bldg. 3 floor samsung-dong, kangnam-ku seoul, korea 135-882 tel: 82-2-554-7200 fax: 82-2-558-5934 singapore microchip technology singapore pte ltd. 200 middle road #07-02 prime centre singapore, 188980 tel: 65-6334-8870 fax: 65-6334-8850 taiwan microchip technology taiwan 11f-3, no. 207 tung hua north road taipei, 105, taiwan tel: 886-2-2717-7175 fax: 886-2-2545-0139 europe denmark microchip technology nordic aps regus business centre lautrup hoj 1-3 ballerup dk-2750 denmark tel: 45 4420 9895 fax: 45 4420 9910 france microchip technology sarl parc d ? activite du moulin de massy 43 rue du saule trapu batiment a - ler etage 91300 massy, france tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany microchip technology gmbh gustav-heinemann ring 125 d-81739 munich, germany tel: 49-89-627-144 0 fax: 49-89-627-144-44 italy microchip technology srl centro direzionale colleoni palazzo taurus 1 v. le colleoni 1 20041 agrate brianza milan, italy tel: 39-039-65791-1 fax: 39-039-6899883 united kingdom arizona microchip technology ltd. 505 eskdale road winnersh triangle wokingham berkshire, england rg41 5tu tel: 44 118 921 5869 fax: 44-118 921-5820 03/01/02 w orldwide s ales and s ervice
|
