This document intended describe functional differences electrical spec

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PIC16F83 PIC16F84A Migration
This document intended describe functional differences electrical specification differences that present when migrating from device next. Table shows considerations that must taken into account when migrating from PIC16F83 PIC16F84A. Table shows electrical timing differences.
Even though compatible devices tested same electrical specifications, device characteristics different from each other (due process differences). These process differences should have effect systems that were designed well within device specifications. systems that operate close device specifications, process differences cause device behave differently.
Even though user made changes oscillator circuit, oscillator operation should verified ensure that starts performs expected. Adjusting loading capacitor values oscillator mode required.
TABLE
Module Memory
PIC16F83 PIC16F84A FUNCTIONAL DIFFERENCES
Differences from PIC16F83 Program Memory (FLASH): PIC16F83 words. PIC16F84A 1024 words. Data Memory (RAM): PIC16F83 bytes. PIC16F84A bytes.
Oscillator Legend:
PIC16F83 oscillator 10MHz. PIC16F84A oscillator 20MHz. Issues exist with regard application circuit. Issues exist with regard user program.
MEMORY
Program addressing paging PIC16F83 upwardly compatible with PIC16F84A. code changes required. SFR's remain same addresses, performing same functions both devices. Data space addressing banking PIC16F83 upwardly compatible with PIC16F84A. code changes required.
OSCILLATOR
PIC16F84A crystals MHz, resulting double execution speed. changes code, other than timing concerns, required. changes configuration word required. crystal loading capacitors need adjusted higher speed crystal, verifying oscillator operation same speed already recommended transition from PIC16F83 PIC16F84A.
1999 Microchip Technology Inc.
DS30071A-page
TABLE
Param Core
PIC16F83 PIC16F84A SPECIFICATION DIFFERENCES
PIC16F83 Symbol Characteristic PIC16F84A Units
FOSC D001 D001A D004A D010A TmcL SVDD
Eternal CLKIN Frequency mode) Oscillator Frequency mode) Supply Voltage (XT, modes) Supply Voltage mode) MCLR pulse width (low) rise rate ensure internal Poweron Reset signal (PWRT disabled) Supply current during FLASH programming (Fosc MHz, 5.5V) Supply Current mode (VDD 5.5V) PIC16F83 (FOSC MHz) PIC16F84A (FOSC MHz)
V/mS
D013
1.02 1.02
D021 D021A D022
Power down current (VDD 4.0V, disabled) Module Differential Current Watchdog Timer
Commercial Industrial Commercial Extended
IWDT
D040 D040A D041 D042 D043 D043A D050 VHYS
Input High Voltage Ports with buffer (4.5V<VDD<5.5V)1 (VDD Entire Range)1 with Schmitt Trigger MCLR, RA4/T0CKI OSC1 mode) OSC1 (XT, modes) OSC1 mode) Hysteresis Schmitt Trigger inputs
0.48VDD 0.45VDD 0.85VDD 0.7VDD
0.25VDD 0.8VDD 0.8VDD 0.7VDD 0.9VDD
EEPROM Data Memory D121 D122 VDRW TDEW read/write Erase/Write Cycle Time VMIN VMIN
FLASH Program Memory D131 D133 TDEW read Erase/Write Cycle Time VMIN VMIN
Data "Typ" column 25°C unless otherwise stated. These parameters design guidance only tested. Note user choose better specifications. This specification changed since last data sheet errata published 5/99.
DS30071A-Page
1999 Microchip Technology Inc.
NOTES:
DS30071A-Page
1999 Microchip Technology Inc.
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11/15/99
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York
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Jose
Microchip Technology Inc. 2107 North First Street, Suite Jose, 95131 Tel: 408-436-7950 Fax: 408-436-7955
Microchip received QS-9000 quality system certification worldwide headquarters, design wafer fabrication facilities Chandler Tempe, Arizona July 1999. Company's quality system processes procedures QS-9000 compliant PICmicro® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs microperipheral products. addition, Microchip's quality system design manufacture development systems 9001 certified.
rights reserved. 1999 Microchip Technology Incorporated. Printed USA. 11/99
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1999 Microchip Technology Inc.

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