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    REPLACEMENT OF AT89C51 Search Results

    REPLACEMENT OF AT89C51 Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    25LS2518PC Rochester Electronics LLC Replacement for AMD part number AM25LS2518PC. Buy from authorized manufacturer Rochester Electronics. Visit Rochester Electronics LLC Buy
    74LS491ANS Rochester Electronics LLC Replacement for AMD part number SN74LS491ANS. Buy from authorized manufacturer Rochester Electronics. Visit Rochester Electronics LLC Buy
    9519A-1JC Rochester Electronics LLC Replacement for AMD part number AM9519A-1JC. Buy from authorized manufacturer Rochester Electronics. Visit Rochester Electronics LLC Buy
    2147-55/BYA Rochester Electronics LLC Replacement for AMD part number AM2147-55/BYA. Buy from authorized manufacturer Rochester Electronics. Visit Rochester Electronics LLC Buy
    25S18FM/B Rochester Electronics LLC Replacement for AMD part number AM25S18FMB. Buy from authorized manufacturer Rochester Electronics. Visit Rochester Electronics LLC Buy

    REPLACEMENT OF AT89C51 Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    M25P08

    Abstract: MD2800-D08 pmc flash pm49fl004t-33jc MD2810-D08 m25p04 SDTB-128 MD2811-D32-V3 M25P08-V-MN-6-T Sandisk TSOP EPROM databook am27c256 120
    Text: SST Base Memory Cross Reference Table Silicon Storage Technology, Inc. Density Voltage Organized as x8/ x16 SST AMD ST Microelectronics Atmel Intel Winbond Flash 512K 5V 8 SST39SF512; SST29EE512 AM28F512 M29F512 AT49F512, AT29C512 - W29EE512 1M 5V 8 SST39SF010; SST29EE010


    Original     		SST39SF512; SST29EE512 AM28F512 M29F512 AT49F512, AT29C512 W29EE512 SST39SF010; SST29EE010 AM29F010, M25P08 MD2800-D08 pmc flash pm49fl004t-33jc MD2810-D08 m25p04 SDTB-128 MD2811-D32-V3 M25P08-V-MN-6-T Sandisk TSOP EPROM databook am27c256 120 PDF

    flash programmer circuit for AT89c2051

    Abstract: isp programmer circuit for AT89c2051 In-system Programmer for AT89c51 low cost eeprom programmer circuit diagram atmel at89c52 architecture atmel AT89C52 PROGRAMMER flash programmer circuit for AT89c55 flash programmer circuit for AT89c51 led interface with AT89C51 spi flash programmer schematic
    Text: FLASH-BASED MICROCONTROLLERS Portable Equipment, Telecommunications, Avionics, Military In-System Programmable Military, Industrial, Custom Chips, Glue Logic Logic Devices Consumer Automotive Telecommunications, Computers Nonvolatile Memories Micro/ Peripherals


    Original     		AT89C51 MICROFLASH/20 FLASH/20 AT89C51 AT89LV51 AT89C52 AT89LV52 AT89C55 AT89C2051 AT89C1051 flash programmer circuit for AT89c2051 isp programmer circuit for AT89c2051 In-system Programmer for AT89c51 low cost eeprom programmer circuit diagram atmel at89c52 architecture atmel AT89C52 PROGRAMMER flash programmer circuit for AT89c55 flash programmer circuit for AT89c51 led interface with AT89C51 spi flash programmer schematic PDF

    AT90SC7272C

    Abstract: T5757 AVR atmega8515 led matrix AT78C5010 fingerprint scanner circuit ATSAM2193 STK502 voltage regulator Stepper motor control using AT89S52 STK502 voltage regulator ic atr0890
    Text: ATMEL PRODUCT GUIDE August 2004 Atmel Corporation • 2325 Orchard Parkway • San Jose, CA 95131 TEL: 408 441-0311 • FAX: (408) 487-2600 Web Site: http://www.atmel.com ATMEL’S PRODUCTS Atmel Corporation is an industry leader in the design and manufacture of advanced semiconductors, with focus on microcontrollers, nonvolatile memory, logic, radio frequency (RF) components and sensors. These functions are marketed as


    Original     		U6808B U6809B U6812B U6813B U6815BM U6820BM U7004B U7006B U9280M AT90SC7272C T5757 AVR atmega8515 led matrix AT78C5010 fingerprint scanner circuit ATSAM2193 STK502 voltage regulator Stepper motor control using AT89S52 STK502 voltage regulator ic atr0890 PDF

    T5757

    Abstract: Microcontroller - AT89s52 connections with lcd Stepper motor control using AT89S52 DC MOTOR SPEED CONTROL SYSTEM USING AT89S52 MICRO AVR voltage regulator schematic using Triac hand dryer circuit using 8051 gsm modem interface AT89s51 mv silicon mp3 player usb sd card STK 439 Stereo amplifier GSM module Interface with At89s52
    Text: ATMEL PRODUCT GUIDE February 2005 Atmel Corporation • 2325 Orchard Parkway • San Jose, CA 95131 TEL: 408 441-0311 • FAX: (408) 487-2600 Web Site: http://www.atmel.com ATMEL’S PRODUCTS Atmel Corporation is a global leader in researching, designing, manufacturing and marketing advanced semiconductors,


    Original     		U2745B U479B U2766B U5020M U2790B U5021M U2793B U6032B U2794B U6043B T5757 Microcontroller - AT89s52 connections with lcd Stepper motor control using AT89S52 DC MOTOR SPEED CONTROL SYSTEM USING AT89S52 MICRO AVR voltage regulator schematic using Triac hand dryer circuit using 8051 gsm modem interface AT89s51 mv silicon mp3 player usb sd card STK 439 Stereo amplifier GSM module Interface with At89s52 PDF

    sandisk micro sd

    Abstract: digital clock using at89s52 microcontroller stepper motor control with avr application notes sandisk micro sd card pin configuration vhdl code for rs232 receiver STK 435 power amplifier Microcontroller AT89S52 vhdl code for ofdm Microcontroller AT89S52 40 pin fingerprint scanner circuit
    Text: Atmel Corporation Atmel Operations Corporate Headquarters 2325 Orchard Parkway San Jose, CA 95131 TEL 1 408 441-0311 FAX 1 (408) 487-2600 Memory 2325 Orchard Parkway San Jose, CA 95131 TEL 1 (408) 441-0311 FAX 1 (408) 436-4314 Regional Headquarters Microcontrollers


    Original     		CH-1705 3271B sandisk micro sd digital clock using at89s52 microcontroller stepper motor control with avr application notes sandisk micro sd card pin configuration vhdl code for rs232 receiver STK 435 power amplifier Microcontroller AT89S52 vhdl code for ofdm Microcontroller AT89S52 40 pin fingerprint scanner circuit PDF

    AT45D321

    Abstract: TbA 2025 ATMCU00100 AT8051 AT27LV520 AT27BV4096 AT27BV512 AT27BV800 AT27BV010 AT27BV020
    Text: R PRODUCT GUIDE October 1998 EPROMs Part Number Organization Speeds Description Availability Battery-Voltage 2.7V to 3.6V AT27BV256 32K x 8 70-150 ns 256K-bit, 2.7-Volt to 3.6-Volt EPROM AT27BV512 64K x 8 70-150 ns 512K-bit, 2.7-Volt to 3.6-Volt EPROM


    Original     		AT27BV256 256K-bit, AT27BV512 512K-bit, AT27BV010 AT27BV1024 AT27BV020 AT27BV040 AT27BV4096 AT27BV400 AT45D321 TbA 2025 ATMCU00100 AT8051 AT27LV520 AT27BV4096 AT27BV512 AT27BV800 AT27BV010 AT27BV020 PDF

    MICROCONTROLLER AT89C51

    Abstract: AT8C51 Microcontroller AT8C51 smd code book ATmel AT89C2051 lock bit MICROCONTROLLER AT89 AT891051 AT89CS Atmel AT89C51 lock ATMEL CORPORATION
    Text: Atmel Corporation Microcontroller Data Book 1995 is the registered trademark of Atmel Corporation, 2125 O’Nel Drive, San Jose, CA 95131 Important Notice Atmel guarantees that its circuits will be free from defects of material and workmanship under normal use and service, and that these circuits will perform to current specifications in accordance


    Original     		29-ATMEL MICROCONTROLLER AT89C51 AT8C51 Microcontroller AT8C51 smd code book ATmel AT89C2051 lock bit MICROCONTROLLER AT89 AT891051 AT89CS Atmel AT89C51 lock ATMEL CORPORATION PDF

    GMS80C701

    Abstract: LA 7805 87C52 Siemens 87C51 replacement atmel 0848 datasheet 7805 L pt 8538 C501-1E ST 7805 80C51
    Text: Because time-to-market and flexibility are now the keywords for all electronic applications, programmable products are becoming more andmoreimportant. Today OTP one-time-programmable products represent a significant and increasing part of the 80C51 market.


    Original     		80C51 TSC87C52 87C52 C501-1E AT89C52 GMS80C701 W87E52 TSC87C51 87C51 GMS80C701 LA 7805 87C52 Siemens 87C51 replacement atmel 0848 datasheet 7805 L pt 8538 C501-1E ST 7805 PDF

    mp3 player schematic diagram

    Abstract: usb flash drive circuit diagram sandisk schematic diagram usb flash sandisk rolling display using led matrix diagram of MP3 player usb and car fm mmc LAYOUT GUIDE SD card socket, footprint to PCB sandisk mp3 player SCHEMATIC LCD connector 26pin details ATMEL 218
    Text: AT85DVK-07 Development Board . Hardware User’s Guide Section 1 Introduction . 1-1


    Original     		AT85DVK-07 4391B mp3 player schematic diagram usb flash drive circuit diagram sandisk schematic diagram usb flash sandisk rolling display using led matrix diagram of MP3 player usb and car fm mmc LAYOUT GUIDE SD card socket, footprint to PCB sandisk mp3 player SCHEMATIC LCD connector 26pin details ATMEL 218 PDF

    8051s

    Abstract: ic 8051 8051 opcode at 89c51 architecture opcodes 89c51 introduction to microcontroller 89C51 OPCODE SHEET FOR 8051 MICROCONTROLLER advantages of 89c51 microcontroller over 8051 89C450 8051 Family
    Text: Maxim > App Notes > MICROCONTROLLERS Keywords: microcontrollers, 89C430, 89C450, 89C51, 89C51RD2, 87C520, 1-clock, UHSM Feb 11, 2005 APPLICATION NOTE 3452 Instant Performance Enhancement with Flash Microcontrollers Abstract: The ultra-high-speed flash microcontrollers UHSFM are 5V, 1-clock 8051s with integrated flash and


    Original     		89C430, 89C450, 89C51, 89C51RD2, 87C520, 8051s com/an3452 DS87C520: DS89C430: ic 8051 8051 opcode at 89c51 architecture opcodes 89c51 introduction to microcontroller 89C51 OPCODE SHEET FOR 8051 MICROCONTROLLER advantages of 89c51 microcontroller over 8051 89C450 8051 Family PDF

    rfid cards with AT89c2051 ic

    Abstract: sram 5volt 4m AT45DB041 AT29C020 MCU00100 AT27BV020 AT27BV040 AT27BV1024 AT27BV256 AT27BV400
    Text: PRODUCT GUIDE April 1998 EPROMs Part Number Organization Speeds Description Availability Battery-Voltage 2.7V to 3.6V AT27BV256 32K x 8 70-150 ns 256K bit, 2.7-Volt to 3.6-Volt EPROM Now AT27BV512 64K x 8 70-150 ns 512K bit, 2.7-Volt to 3.6-Volt EPROM


    Original     		AT27BV256 AT27BV512 AT27BV010 AT27BV1024 AT27BV020 AT27BV040 AT27BV4096 AT27BV400 AT93C56 AT93C57 rfid cards with AT89c2051 ic sram 5volt 4m AT45DB041 AT29C020 MCU00100 AT27BV020 AT27BV040 AT27BV1024 AT27BV256 AT27BV400 PDF

    89lp51

    Abstract: FC51 at89lp programmer p2m0 TPS30 atmel AT89C51RD2 PROGRAMMER FC516 at89lp51ed2 AT89LP51RC2 AT89LP51
    Text: Migrating from AT89C51RB2/RC2/RD2/ED2/IC2/ID2 to AT89LP51RB2/RC2/RD2/ED2/IC2/ID2 New Features • • • • • • • • • • • • • • • • • • • • • • • • SIngle Clock Cycle per Byte Fetch with 20 MIPS Throughput at 20MHz Clock Frequency


    Original     		AT89C51RB2/RC2/RD2/ED2/IC2/ID2 AT89LP51RB2/RC2/RD2/ED2/IC2/ID2 20MHz 40-bit 16x16 32-byte AT89LP51ED2 AT89LP51ID2 AT89LP51RB2/RC2/RD2/ED2 89lp51 FC51 at89lp programmer p2m0 TPS30 atmel AT89C51RD2 PROGRAMMER FC516 at89lp51ed2 AT89LP51RC2 AT89LP51 PDF

    AT89C51 microcontroller

    Abstract: sab8031a-p SAB8051A-P P8052AH SAB8051A MICROCONTROLLER AT89C51 datasheet i87C51 Microcontroller AT89C51 Microcontroller Cross-Reference P8032AH
    Text: Microcontroller Cross-Reference Guide Microcontroller Abbreviated Cross-Reference Guide Intel PART NUMBER i80C31 i80C51 i87C51 i80C52 i87C52 PACKAGE Atmel MCS-51 D P N S no program store 4 Kbytes of ROM & 128 bytes of RAM 4 Kbytes of EPROM & 128 bytes of RAM


    Original     		i80C31 i80C51 i87C51 i80C52 i87C52 MCS-51 AT89C51 AT89C52 AT89C51 microcontroller sab8031a-p SAB8051A-P P8052AH SAB8051A MICROCONTROLLER AT89C51 datasheet i87C51 Microcontroller AT89C51 Microcontroller Cross-Reference P8032AH PDF

    transistor SR 13001

    Abstract: RCA SK CROSS-REFERENCE PCD8572I ATmel 730 24c04 SR 13001 transistor atmel 716 24c04 UNITRODE applications handbook uc3842 -96 all 89c51 microcontroller references book QFP44 footprint HI5618
    Text: INTEGRATED CIRCUITS DATA SHEET PCF5001 POCSAG Paging Decoder Product specification Supersedes data of 1995 Apr 27 File under Integrated Circuits, IC17 1997 Mar 04 Philips Semiconductors Product specification POCSAG Paging Decoder PCF5001 CONTENTS BLOCK DIAGRAMS


    Original     		PCF5001 TAPE11 TAPE13 transistor SR 13001 RCA SK CROSS-REFERENCE PCD8572I ATmel 730 24c04 SR 13001 transistor atmel 716 24c04 UNITRODE applications handbook uc3842 -96 all 89c51 microcontroller references book QFP44 footprint HI5618 PDF

    super avr manual

    Abstract: AT90SC6464C-USB Transponder 125k 80C31 MICROCONTROLLER development board ATMEL VHDL code for ADC and DAC SPI with FPGA interface bluetooth with AVR ATMEGA 16 at93c46 524 ATMega Controller 32k of AT89c52 microcontroller rfid based flash 32 Pin PLCC 2mbit
    Text: R PRODUCT GUIDE June 2000 AT90 Series AVR 8-bit Microcontrollers Part Number Processor Description Availability AT90S1200 AVR AVR RISC, In-System Programmable Microcontroller with 1K Byte Flash and 64 Bytes EEPROM, 20-pin PDIP, 20-lead SOIC and 20-lead SSOP Packages


    Original     		AT90S1200 AT90S2313 AT90S2323 AT90LS2323 AT90S2343 AT90LS2343 AT90S2333 AT90LS2333 20-pin 20-lead super avr manual AT90SC6464C-USB Transponder 125k 80C31 MICROCONTROLLER development board ATMEL VHDL code for ADC and DAC SPI with FPGA interface bluetooth with AVR ATMEGA 16 at93c46 524 ATMega Controller 32k of AT89c52 microcontroller rfid based flash 32 Pin PLCC 2mbit PDF

    8 bit sequential multiplier VERILOG

    Abstract: ATMEGA 32 AVR DATASHEET data sheet of AT89c52 microcontroller rfid based 8 bit microprocessor using vhdl interface bluetooth with AVR ATMEGA 16 interface bluetooth with AVR atmel isp attiny atmega Tiny 84 pin plcc ic base ic at89c51
    Text: R PRODUCT GUIDE September 1999 AT90 Series AVR 8-bit Microcontrollers Part Number Processor AT90S1200 AVR AVR RISC, In-System Programmable Microcontroller with 1K Byte Flash and 64 Bytes EEPROM, 20-pin PDIP, 20-pin SOIC and 20-pin SSOP Packages Description


    Original     		AT90S1200 20-pin AT90S2313 AT90S2323 AT90LS2323 0031U 8 bit sequential multiplier VERILOG ATMEGA 32 AVR DATASHEET data sheet of AT89c52 microcontroller rfid based 8 bit microprocessor using vhdl interface bluetooth with AVR ATMEGA 16 interface bluetooth with AVR atmel isp attiny atmega Tiny 84 pin plcc ic base ic at89c51 PDF

    TH7852A

    Abstract: TH7890M TH7803A TH7890 AT93C56SC TH7802A VHDL code for ADC and DAC SPI with FPGA AT45DB021-SC CAMELIA 1.6M digital dice design of digital VHDL altera
    Text: R PRODUCT GUIDE October 2000 AT90 Series AVR 8-bit Microcontrollers Part Number Processor Description Availability AT90S1200 AVR AVR RISC, In-System Programmable Microcontroller with 1K Byte Flash and 64 Bytes EEPROM, 20-pin PDIP, 20-lead SOIC and 20-lead SSOP Packages


    Original     		AT90S1200 20-pin 20-lead AT90S2313 AT90S2323 AT90LS2323 10/00/35M TH7852A TH7890M TH7803A TH7890 AT93C56SC TH7802A VHDL code for ADC and DAC SPI with FPGA AT45DB021-SC CAMELIA 1.6M digital dice design of digital VHDL altera PDF

    atmel 24c02

    Abstract: atmel 604 24c02 AT89C51 microcontroller SE7501HG2 temperature sensor to micro controller AT89C51 c MC AT89C51 sata hot plug CIRCUIT diagram ATMEL 350 24c02 manual motherboard canada ices 003 class b led interface with AT89C51
    Text: Intel Storage System SSR316MJ2 Hardware Technical Product Specification Intel Order number C75916-001 Revision 1.0 Enterprise Platforms and Services Marketing Revision History Intel® Storage System SSR316MJ2 TPS Revision History Date Feb. 19, 2004 Revision


    Original     		SSR316MJ2 C75916-001 SSR316MJ2 atmel 24c02 atmel 604 24c02 AT89C51 microcontroller SE7501HG2 temperature sensor to micro controller AT89C51 c MC AT89C51 sata hot plug CIRCUIT diagram ATMEL 350 24c02 manual motherboard canada ices 003 class b led interface with AT89C51 PDF

    digital IIR Filter VHDL code

    Abstract: atmel 0718 atmel 0740 smd ic lv 1116 avr410 AVR102 AVR313 design and implementation of digital thermometer using microcontroller MCU00100 ATMEL 0847
    Text: Fax-on-Demand: North America 1- 800 292-8635 / International 1-(408) 441-0732 August 1, 2000 Doc # Description Last Update # of Pages Application Specific Standard Products Communications Doc # Description Security and Smart Card ICs Datasheets Last Update


    Original     		AT24RF08C AT24C01ASC/02SC/04SC/08SC/16SC AT88SC1608 AT88SC153 AT88SC101 AT88SC102 com/atmel/products/prod179 ATF1500AS AT94K ATDS1000PC digital IIR Filter VHDL code atmel 0718 atmel 0740 smd ic lv 1116 avr410 AVR102 AVR313 design and implementation of digital thermometer using microcontroller MCU00100 ATMEL 0847 PDF

    QB25F640S33

    Abstract: microcontroller based temperature controlled fan project report PG4UW EM78Pxxx 89xxx microcontroller 25Pxx DATAMAN-48PRO2 29Fxx microcontroller based temperature control fan avr NVM3060
    Text: User's Manual for DATAMAN-848PRO2 Fast universal 8x 48-pindriver Stand-Alone concurrent multiprogramming system November 2009 COPYRIGHT 2009 Dataman Programmers Ltd This document is copyrighted by Dataman Programmers Ltd, United Kingdom. All rights reserved. This document or any part of it may not be copied, reproduced or translated in


    Original     		DATAMAN-848PRO2 48-pindriver QB25F640S33 microcontroller based temperature controlled fan project report PG4UW EM78Pxxx 89xxx microcontroller 25Pxx DATAMAN-48PRO2 29Fxx microcontroller based temperature control fan avr NVM3060 PDF

    vhdl code for 8-bit serial adder

    Abstract: vhdl code for 8-bit BCD adder AT24CS AT90S4414 DTMF WD1351 AVR314 8032 microcontroller uart programming AVR128 sound recorder AVR410 REAL TIME CLOCK WITH AT89C51
    Text: Fax-on-Demand: North America 1- 800 292-8635 / International 1-(408) 441-0732 May 14, 2001 Doc # Description Application Specific Standard Products Communications Internet Appliances & VoIP 1396 AT75C220 Preliminary Summary 1370 AT75C310 Electrical and Mechanical Characteristics


    Original     		AT75C220 AT75C310 AT76C502A AT76C510 AT86RF211 TRX01) AT86RF401 vhdl code for 8-bit serial adder vhdl code for 8-bit BCD adder AT24CS AT90S4414 DTMF WD1351 AVR314 8032 microcontroller uart programming AVR128 sound recorder AVR410 REAL TIME CLOCK WITH AT89C51 PDF

    SKIIP 33 nec 125 t2

    Abstract: skiip 613 gb 123 ct RBS 6302 ericsson SKIIP 513 gb 173 ct THERMISTOR ml TDK 150M pioneer PAL 010a Project Report of smoke alarm using IC 555 doc SKiip 83 EC 125 T1 ericsson RBS 6000 series INSTALLATION MANUAL Ericsson Installation guide for RBS 6302
    Text: Discontinued and Superseded Stock Number History. This document contains Discontinued and Superseded Stock Number History. The information is listed in the following format: Stock Number: The original RS Stock Number of the item. Brief Description: The Invoice Description of the item.


    Original     		734TL UWEB-MODEM-34 HCS412/WM TLV320AIC10IPFB 100MB NEON250 GA-60XM7E BLK32X40 BLK32X42 SKIIP 33 nec 125 t2 skiip 613 gb 123 ct RBS 6302 ericsson SKIIP 513 gb 173 ct THERMISTOR ml TDK 150M pioneer PAL 010a Project Report of smoke alarm using IC 555 doc SKiip 83 EC 125 T1 ericsson RBS 6000 series INSTALLATION MANUAL Ericsson Installation guide for RBS 6302 PDF

    32 bit carry-select adder code VHDL

    Abstract: REAL TIME CLOCK using AT89s8252 ATMEL 0749 atmel 0748 atmel 0740 usb programmer circuit for AT89c51 0847 atmel atmel 0847 digital thermometer with atmel 8051 AVR128 sound recorder
    Text: Fax-on-Demand: North America 1- 800 292-8635 / International 1-(408) 441-0732 December 11, 2000 Doc # Description Last Update # of Pages Application Specific Standard Products Communications Telephony Doc # Description Video AT76C651 10/00 37 1135 AT76C3XX Summary


    Original     		AT76C651 AT76C3XX AT75C120 AT76C651 AT76C651B AT75C220 com/atmel/products/prod179 32 bit carry-select adder code VHDL REAL TIME CLOCK using AT89s8252 ATMEL 0749 atmel 0748 atmel 0740 usb programmer circuit for AT89c51 0847 atmel atmel 0847 digital thermometer with atmel 8051 AVR128 sound recorder PDF

    Microcontroller AT89S52 40 pin instructions

    Abstract: KEYPAD 4 X 4 interfacing with at89s52 atmel 0704 REAL TIME CLOCK using AT89s8252 ATMEl 0910 VOICE RECORDER IC digital clock using at89s52 microcontroller atmel 0945 atmel 0716 AVR128 sound recorder
    Text: Fax-on-Demand: North America 1- 800 292-8635 / International 1-(408) 441-0732 August 13, 2001 Doc # Description Application Specific Standard Products Communications Internet Appliances & VoIP 1784 AT75C220 Eng. Sample Errata Sheet V1.0 1396 AT75C220 Preliminary Summary


    Original     		AT75C220 AT75C310 AT75C310 AT75C320 AT76C901 AT76C502A Microcontroller AT89S52 40 pin instructions KEYPAD 4 X 4 interfacing with at89s52 atmel 0704 REAL TIME CLOCK using AT89s8252 ATMEl 0910 VOICE RECORDER IC digital clock using at89s52 microcontroller atmel 0945 atmel 0716 AVR128 sound recorder PDF