M PIC16F83 → PIC16F84A 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. Table 1 shows the considerations that must be taken into account when migrating from the PIC16F83 to the PIC16F84A. Table 2 shows electrical and timing differences. 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. Note: The user should verify that the device oscillator starts and performs as expected. Adjusting the loading capacitor values and/or the oscillator mode may be required. TABLE 1: No. 1 PIC16F83 → PIC16F84A FUNCTIONAL DIFFERENCES Module Memory Differences from PIC16F83 Program Memory (FLASH): H/W S/W — Yes — Yes Yes Yes The PIC16F83 has 512 words. The PIC16F84A has 1024 words. Data Memory (RAM): The PIC16F83 has 36 bytes. The PIC16F84A has 68 bytes. 2 Oscillator The PIC16F83 oscillator can run up to 10 MHz. The PIC16F84A oscillator can run up to 20 MHz. Legend: H/W - Issues may exist with regard to the application circuit. S/W - Issues may exist with regard to the user program. MEMORY Program addressing and paging in the PIC16F83 is upwardly compatible with the PIC16F84A. No code changes are required. All SFR’s remain at the same addresses, performing the same functions for both devices. Data space addressing and banking in the PIC16F83 is upwardly compatible with the PIC16F84A. No code changes are required. OSCILLATOR The PIC16F84A can use crystals up to 20 MHz, resulting in double the execution speed. No changes to the code, other than for timing concerns, are required. No changes to the configuration word are required. The crystal loading capacitors may need to be adjusted for the higher speed crystal, but verifying oscillator operation at the same speed is already recommended for the transition from the PIC16F83 to the PIC16F84A. 2001 Microchip Technology Inc. DS30071B-page 1 PIC16F83 → PIC16F84A SPECIFICATION DIFFERENCES TABLE 2: Param No. PIC16F83 Symbol PIC16F84A Characteristic Units Min Typ† Max Min Typ† Max Core D001 D001A FOSC Eternal CLKIN Frequency (HS mode) Oscillator Frequency (HS mode) DC 1 — — 10 10 DC 1 — — 20 20 MHz MHz VDD VDD Supply Voltage (XT, RC, LP modes) Supply Voltage (HS mode) 4.0 4.5 — — 6.0 6.0 4.0 4.5 — — 5.5 5.5 V V 1 — — 2 — — µS N/A N/A N/A TBD — — V/mS Supply current during FLASH programming (FOSC = 4.0 MHz, VDD = 5.5V) — 7.3 10 — 3.0 10 mA Supply Current HS mode (VDD = 5.5V) — 5 10 30 TmcL MCLR pulse width (low) D004A SVDD VDD rise rate to ensure internal Poweron Reset signal (PWRT disabled) D010A IDD D013 IDD PIC16F83 (FOSC = 10 MHz) PIC16F84A (FOSC = 20 MHz) D021 IPD D021A D022 ∆IWDT VIH D040 D040A D041 mA — 10 20 mA 3.0 µA µA Power-down current (VDD = 4.0V, WDT disabled) Commercial — 1.0 14 Industrial — 1.0 14 — 1.0 Module Differential Current Watchdog Timer Commercial N/A N/A N/A — 6.0 20 µA Extended N/A N/A N/A — — 25 µA — — — VDD VDD VDD 2.0 0.25VDD 0.8VDD — — — VDD VDD VDD V V V Input High Voltage I/O Ports with TTL buffer (4.5V<VDD<5.5V)(1) 2.4 (V DD = Entire Range)(1) 0.48VDD with Schmitt Trigger 0.45VDD D042 MCLR, RA4/T0CKI OSC1 (RC mode) 0.85VDD — VDD 0.8VDD — VDD V D043 D043A OSC1 (XT, HS and LP modes) OSC1 (RC mode) 0.7VDD N/A — N/A VDD N/A 0.7VDD 0.9VDD — — VDD VDD V V TBD — — — 0.1 — V VMIN — 6.0 VMIN — 5.5 V — 10 20 — 4 8 mS VMIN — 6.0 VMIN — 5.5 V — 10 20 — 4 8 mS D050 VHYS Hysteresis of Schmitt Trigger inputs EEPROM Data Memory D121 VDRW VDD for read/write D122 TDEW Erase/Write Cycle Time FLASH Program Memory D131 VPR D133 TDEW † VDD for read Erase/Write Cycle Time Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested. Note 1: The user may choose the better of the two specifications. DS30071B-Page 2 2001 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, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, KEELOQ, SEEVAL, MPLAB and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Total Endurance, ICSP, In-Circuit Serial Programming, FilterLab, MXDEV, microID, FlexROM, fuzzyLAB, MPASM, MPLINK, MPLIB, PICC, PICDEM, PICDEM.net, ICEPIC, Migratable Memory, FanSense, ECONOMONITOR, Select Mode, dsPIC, rfPIC and microPort 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. © 2001, 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, KEELOQ® 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. 2001 Microchip Technology Inc. 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