This document intended describe functional differences electrical spec

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PIC16C622A PIC16F628 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 PIC16C622A PIC16F628. 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 Oscillator Oscillator Oscillator Oscillator USART Memory Memory Legend:
PIC16C622A PIC16F628 FUNCTIONAL DIFFERENCES
Differences from PIC16C622A mode Dual Speed mode mode IntRC mode 9-bit USART EEPROM Data Memory Issues exist with regard application circuit. Issues exist with regard user program. Prog. Issues exist with regard programming. Prog.
Programming Voltage Programming mode
OSCILLATOR MODULE
Mode
PIC16F628 supports External Resistor oscillator mode. This mode differs from traditional oscillator mode that only resistor bias current required. Designers should verify their oscillator design suitability application before use. oscillator mode also supports Dual Speed mode.
Mode
PIC16F628 supports External Clock-in mode. designed usage applications where system clock available. This mode provides clock directly PIC16F628 core. There gain stage in-line. Designers should verify their oscillator design suitability application before use.
IntRC Mode
PIC16F628 IntRC oscillator mode supports Dual Speed mode also.
1999 Microchip Technology Inc.
DS30610A-page
Dual Speed Mode
PIC16F628 supports Dual Speed mode when configured either IntRC modes. This sub-mode operation toggles between fixed frequency frequency either IntRC modes. CONFIG Reg. bits FOSC<2:0> Description mode w/clkout mode w/clkout mode clkout mode clkout IntRC w/clkout IntRC w/clkout IntRC clkout IntRC clkout PCON Reg. OSCF Result bias'ed speed bias'ed speed
USART MODULE
9-bit USART
PIC16F628 USART supports 9-bit mode. This mode useful multi-processor communications. When bits ADEN register RCSTA set, multi-processor communication enabled. used indicate whether address data being transmitted Master.
MEMORY ORGANIZATION MODULE
PIC16F628 bytes data while PIC16C622A 128.
EEPROM Data
PIC16F628 bytes EEPROM data memory.
PROGRAMMING MODULE
Voltage Programming Mode
PIC16F628 supports Voltage Programming mode. When configuration word asserted, placing RB4/PGM will instruct part enter Voltage Programming mode. Note While this mode, longer used general purpose pin. must 5.0V ±10% during erase/program operations while voltage programming mode.
DS30610A-Page
1999 Microchip Technology Inc.
TABLE
Parm. D010
PIC16C622A PIC16F628 ELECTRICAL SPECIFICATION DIFFERENCES
PIC16C622A Data Sheet PIC16F628 Data Sheet FOSC=4MHz, VDD=3.0V, Disabled, mode (Note FOSC=10MHz, VDD=3.0V, Disabled, mode (Note VDD=4.0V (125°) VDD=4.0V VDD=4.0V
Sym.
Characteristic
Units
Conditions
Supply Current (Note
D023
IWDT Current (Note ICOMP Comparator Current each Comparator (Note IVREF VREF Current (Note
Note
These parameters characterized tested. Data "Typ" column 5.0V, 25°C, unless otherwise stated. These parameters design guidance only tested. supply current mainly function operating voltage frequency. Other factors such loading switching rate, oscillator type, internal code execution pattern, temperature also have impact current consumption. test conditions measurements active operation mode are: OSC1 external square wave, from rail rail; pins tri-stated, pulled VDD, MCLR VDD; enabled/disabled specified. power down current SLEEP mode does depend oscillator type. Power down current measured with part SLEEP mode, with pins hi-impedance state tied VSS. configuration, current through Rext included. current through resistor estimated formula VDD/2Rext (mA) with Rext current additional current consumed when this peripheral enabled. This current should added base measurement. Commercial temperature range only. Includes static current. Does include reads writes.
DS30610A-Page
1999 Microchip Technology Inc.
TABLE
Parm. D010 D023
PIC16LC622A PIC16LF628 ELECTRICAL SPECIFICATION DIFFERENCES
PIC16LC622A Data Sheet PIC16LF628 Data Sheet FOSC=4MHz, VDD=2.5V, Disabled, mode (Note VDD=3.0V VDD=4.0V (125°) VDD=3.0V VDD=4.0V VDD=3.0V VDD=4.0V
Sym.
Characteristic
Units
Conditions
Supply Current (Note
IWDT Current (Note ICOMP Comparator Current each Comparator (Note IVREF VREF Current (Note
Note
These parameters characterized tested. Data "Typ" column 5.0V, 25°C, unless otherwise stated. These parameters design guidance only tested. supply current mainly function operating voltage frequency. Other factors such loading switching rate, oscillator type, internal code execution pattern, temperature also have impact current consumption. test conditions measurements active operation mode are: OSC1 external square wave, from rail rail; pins tri-stated, pulled VDD, MCLR VDD; enabled/disabled specified. power down current SLEEP mode does depend oscillator type. Power down current measured with part SLEEP mode, with pins hi-impedance state tied VSS. configuration, current through Rext included. current through resistor estimated formula VDD/2Rext (mA) with Rext current additional current consumed when this peripheral enabled. This current should added base measurement. Includes static current. Does include reads writes.
DS30610A-page
1999 Microchip Technology Inc.
NOTES:
1999 Microchip Technology Inc.
DS30610A-page
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11/23/99
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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. 12/99
Printed recycled paper.
Information contained this publication regarding device applications like intended suggestion only superseded updates. representation warranty given liability assumed Microchip Technology Incorporated with respect accuracy such information, infringement patents other intellectual property rights arising from such otherwise. Microchip's products critical components life support systems authorized except with express written approval Microchip. licenses conveyed, implicitly otherwise, under intellectual property rights. Microchip logo name registered trademarks Microchip Technology Inc. U.S.A. other countries. rights reserved. other trademarks mentioned herein property their respective companies.
DS30610A-page
1999 Microchip Technology Inc.

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