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    89C52 MICROCONTROLLER ATMEL Search Results

    89C52 MICROCONTROLLER ATMEL Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    LBAA0QB1SJ-295 Murata Manufacturing Co Ltd SX1262 MODULE WITH OPEN MCU Visit Murata Manufacturing Co Ltd
    TMP89FM82DUG Toshiba Electronic Devices & Storage Corporation 8-bit Microcontroller/Processing Performance Equivalent to a 16-bit MCU/LQFP48-P-0707-0.50D Visit Toshiba Electronic Devices & Storage Corporation
    TMP89FS60BFG Toshiba Electronic Devices & Storage Corporation 8-bit Microcontroller/Processing Performance Equivalent to a 16-bit MCU/P-LQFP64-1414-0.80-002 Visit Toshiba Electronic Devices & Storage Corporation
    TMP89FS63BUG Toshiba Electronic Devices & Storage Corporation 8-bit Microcontroller/Processing Performance Equivalent to a 16-bit MCU/P-LQFP52-1010-0.65-002 Visit Toshiba Electronic Devices & Storage Corporation
    TMP89FS62BUG Toshiba Electronic Devices & Storage Corporation 8-bit Microcontroller/Processing Performance Equivalent to a 16-bit MCU/P-LQFP44-1010-0.80-003 Visit Toshiba Electronic Devices & Storage Corporation

    89C52 MICROCONTROLLER ATMEL Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    AT89C51 INSTRUCTIONS SET

    Abstract: program for digital clock AT89C51 digital clock programming AT89C51 digital clock using AT89C51 digital clock using c AT89C51 89c51 c programming codes AT89C51 INSTRUCTION SET MICROCONTROLLER AT89C51 pin diagram at89c51 digital clock digital lock using AT89C51
    Text: Atmel 8051 Microcontroller Family - Product Selection Guide Device 89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 1K 1K 2K 4K 4K 8K 20K 8K 12K ON-CHIP MEMORY Flash Bytes EEPROM (Bytes) 2K SRAM (Bytes) 64 64 128 128 128 256 256 256 256 In-System Programmable (ISP)


    Original     		89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 AT89C51-20PI AT89C51 INSTRUCTIONS SET program for digital clock AT89C51 digital clock programming AT89C51 digital clock using AT89C51 digital clock using c AT89C51 89c51 c programming codes AT89C51 INSTRUCTION SET MICROCONTROLLER AT89C51 pin diagram at89c51 digital clock digital lock using AT89C51 PDF

    atmel 8051 microcontroller

    Abstract: 89s53 atmel 89c52 instruction set digital code lock system using 89c52 89C4051 stop watch atmel 89c51 MCS Series atmel 89c52 89C1051 Automatic Dam Control Using 89c51
    Text: Atmel 8051 Microcontroller Family - Product Selection Guide Device 89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 1K 1K 2K 4K 4K 8K 20K 8K 12K ON-CHIP MEMORY Flash Bytes EEPROM (Bytes) 2K SRAM (Bytes) 64 64 128 128 128 256 256 256 256 In-System Programmable (ISP)


    Original     		89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 AT89S53-16AA atmel 8051 microcontroller 89s53 atmel 89c52 instruction set digital code lock system using 89c52 89C4051 stop watch atmel 89c51 MCS Series atmel 89c52 89C1051 Automatic Dam Control Using 89c51 PDF

    at89c52 digital clock

    Abstract: digital lock using AT89C51 20 pin Atmel 89C4051 microcontroller 89c51 c programming codes digital code lock system using 89c52 89C1051 Atmel 89C51 microcontroller Datasheet atmel 89c52 digital clock program for 89c52 at 89c51 architecture
    Text: Atmel 8051 Microcontroller Family - Product Selection Guide Device 89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 1K 1K 2K 4K 4K 8K 20K 8K 12K ON-CHIP MEMORY Flash Bytes EEPROM (Bytes) 2K SRAM (Bytes) 64 64 128 128 128 256 256 256 256 In-System Programmable (ISP)


    Original     		89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 89C55-16PA at89c52 digital clock digital lock using AT89C51 20 pin Atmel 89C4051 microcontroller 89c51 c programming codes digital code lock system using 89c52 89C1051 Atmel 89C51 microcontroller Datasheet atmel 89c52 digital clock program for 89c52 at 89c51 architecture PDF

    20 pin Atmel 89C4051 microcontroller

    Abstract: temperature controller using 89c51 20 pin Atmel 89C4051 microcontroller Datasheet pin diagram of 89c2051 microcontroller AT89C4051 MICRO CONTROLLER atmel 89c52 digital code lock system using 89c52 89C4051 atmel 89c2051 datasheet programming 89C2051
    Text: Atmel 8051 Microcontroller Family - Product Selection Guide Device 89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 1K 1K 2K 4K 4K 8K 20K 8K 12K ON-CHIP MEMORY Flash Bytes EEPROM (Bytes) 2K SRAM (Bytes) 64 64 128 128 128 256 256 256 256 In-System Programmable (ISP)


    Original     		89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 20-Lead, 20 pin Atmel 89C4051 microcontroller temperature controller using 89c51 20 pin Atmel 89C4051 microcontroller Datasheet pin diagram of 89c2051 microcontroller AT89C4051 MICRO CONTROLLER atmel 89c52 digital code lock system using 89c52 89C4051 atmel 89c2051 datasheet programming 89C2051 PDF

    89c51 atmel specification

    Abstract: atmel 89c52 instruction set atmel 8051 microcontroller digital code lock system using 89c52 20 pin Atmel 89C2051 microcontroller temperature controller program for 89c2051 89c51 c programming codes 89S53 instruction set atmel 89c52 digital clock with atmel 8051
    Text: Atmel 8051 Microcontroller Family - Product Selection Guide Device 89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 1K 1K 2K 4K 4K 8K 20K 8K 12K ON-CHIP MEMORY Flash Bytes EEPROM (Bytes) 2K SRAM (Bytes) 64 64 128 128 128 256 256 256 256 In-System Programmable (ISP)


    Original     		89C1051 89C1051U 89C2051 89C4051 89C51 89C52 89C55 89S8252 89S53 MS-001 89c51 atmel specification atmel 89c52 instruction set atmel 8051 microcontroller digital code lock system using 89c52 20 pin Atmel 89C2051 microcontroller temperature controller program for 89c2051 89c51 c programming codes 89S53 instruction set atmel 89c52 digital clock with atmel 8051 PDF

    atmel 8052 microcontroller

    Abstract: Atmel 89C51 microcontroller Datasheet atmel 8052 atmel 89c52 8052 microcontroller 40 pin 89C51 8052 microcontroller philips 8052 datasheet atmel 8051 40-PIN Atmel 89C51 microcontroller
    Text: WICE-8052 8052 IN-CIRCUIT EMULATOR 2-pin signal line hook 40-pin IC socket DC power supply EXT CRYSTAL adaptor System software disk Operation manual Dimension : 14cm 11cm 4.6 cm Weight : 380 gs Temperature : +5 to +45 Humidity : up to 90 % non-condensing Supports trace On/Off function


    Original     		WICE-8052 40-pin WICE-8052, WICE-8052 5000m 16-bit 8xC851 26-pin W78C31B W78C32B atmel 8052 microcontroller Atmel 89C51 microcontroller Datasheet atmel 8052 atmel 89c52 8052 microcontroller 40 pin 89C51 8052 microcontroller philips 8052 datasheet atmel 8051 40-PIN Atmel 89C51 microcontroller PDF

    Micro-Pro 51

    Abstract: 8051 24cxx code 89c52 microcontroller 89C52 MICROCONTROLLER free programming 89C52 atmel 89c52 port pin 24cxx Microcontroller - AT89C51 plcc 44 pin details 25cxx 93cxx
    Text: t h e : p r o g r a m m e r w i t h a f u t u r e Programs on-chip code ROM of many 8051 Microcontroller derivatives Re-configurable hardware allows new devices to be added with a siffipie software lipdâtê FAST programming speeds due to optimised FPGA hardware for each target device


    OCR Scan     		250mA MP51-SYS AD-ICE-51 AD-PLCC44-A PLCC-44 DIL-40 SOIC-20 MP-01 Micro-Pro 51 8051 24cxx code 89c52 microcontroller 89C52 MICROCONTROLLER free programming 89C52 atmel 89c52 port pin 24cxx Microcontroller - AT89C51 plcc 44 pin details 25cxx 93cxx PDF

    atmel 89c52

    Abstract: Microcontroller AT89C52 89C52 EXTERNAL RAM atmel 89c52 instruction set 89C52 89C52 MICROCONTROLLER DATASHEET free download he10 db9 microcontroller 89c52 board AT89C52 AT90SCC
    Text: Features • Includes: – Emulation Software and Hardware – Development Chip Similar to Production Device – Built-in Card Reader to Program Card Samples • Final Phase of Development can be Done using a Smart Card Sample – Flash-based Microcontroller-Production can Start Immediately


    Original     		90SCC RS232 EWA90) CWA90) EWA90 AT90SCC AT90SCC. atmel 89c52 Microcontroller AT89C52 89C52 EXTERNAL RAM atmel 89c52 instruction set 89C52 89C52 MICROCONTROLLER DATASHEET free download he10 db9 microcontroller 89c52 board AT89C52 PDF

    PXC52

    Abstract: atmel 89c55 intel 80c535 n User Manual Hitex AX51 Emulator SDA30C164 HITEX TELETEST 51 80c31 code manual 89C2051 APPLICATIONS MX51-B intel 8051 microcontroller architecture
    Text: Product Catalog 1/98 Development Tools for the - 8051 Family - MCS-251 Family General Information This catalog gives an overview of the products offered by Hitex's 8051 team. As for the prices, please see the attached price list. All prices are subject to change without notice.


    Original     		MCS-251® PLCC68 8x930H APX930A 8x930A PP251 PXC52 atmel 89c55 intel 80c535 n User Manual Hitex AX51 Emulator SDA30C164 HITEX TELETEST 51 80c31 code manual 89C2051 APPLICATIONS MX51-B intel 8051 microcontroller architecture PDF

    AT89X52

    Abstract: AT898252 atmel 8052 microcontroller AT89C2051 Assembler Users Guide at89x51 8052 intel assembly language code list 89c51 hex code atmel 8052 MCS-51 Macro Assembler Users Guide MCS-96 Macro Assembler Users guide
    Text: Integrated Development System for the 8051 PRODUCT OVERVIEW Preliminary Manual PK51 Product Overview V1.03 Copyright Information Information in this document is subject to change without notice and does not represent a commitment on the part of the manufacturer. The software described in


    Original     		C51TM MCS-51 AT89X52 AT898252 atmel 8052 microcontroller AT89C2051 Assembler Users Guide at89x51 8052 intel assembly language code list 89c51 hex code atmel 8052 MCS-51 Macro Assembler Users Guide MCS-96 Macro Assembler Users guide PDF

    89c8252

    Abstract: NEC 78F9026 28C64 EPROM programmer 82C55 NEC 89C52 MICROCONTROLLER DATASHEET free download atmel 89c52 INTEL END OF LIFE 80C196 Mitsubishi microcontroller bootloader pin detail for atmel 89c52 78f9026
    Text: EasyFLASHTM Solutions EasyFLASHTM Solving System Problems & Benefits of Using Flash PSDs We make it easy! Presentation #5 EasyFLASHTM April 2000 200004easyflashsolutions 1 Available Presentations • Main Presentations Recommended : – Presentation 1: Brief Introduction to Company and Products


    Original     		200004easyflashsolutions 1-877-WSI-PSDS 89c8252 NEC 78F9026 28C64 EPROM programmer 82C55 NEC 89C52 MICROCONTROLLER DATASHEET free download atmel 89c52 INTEL END OF LIFE 80C196 Mitsubishi microcontroller bootloader pin detail for atmel 89c52 78f9026 PDF

    LEAPER-3

    Abstract: 74189 7489 sram 4N34 89C51 interfacing with lcd display ic 74192 pin configuration interfacing 20x4 LCD with 89c51 IC 74189 DATA LEAP-U1 LEAPER-10 driver
    Text: COMPANY PROFILE 1 Leap Electronic was established in 1980 located in Taipei Taiwan. With great experienced employees, Leap has dedicated on test equipment and provided a whole and perfect environment of development. Additional, the Company has been qualified by major IC manufacturer such as ATMEL, AMD, MICROCHIP, WINBOND,etc.


    Original     		PIC16C52/54/54A PIC16C55/56/57/57A/58A PIC12C508/509 PIC16C61 PIC16C620/621/622 PIC16C71/710 PIC16C62/63/64/65 PICC16C72/73/74/74A PIC16C83/84 PIC17C42/42A/43/44 LEAPER-3 74189 7489 sram 4N34 89C51 interfacing with lcd display ic 74192 pin configuration interfacing 20x4 LCD with 89c51 IC 74189 DATA LEAP-U1 LEAPER-10 driver 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

    CONTROLLER

    Abstract: pin diagram of microcontroller at89c52 MICROCONTROLLER AT89C52 architecture atmel 89c52 atmel at89c52 AT89C52 power port Microcontroller AT89C52 at89c52 external pullups programming 89C52 80C52
    Text: Features • Compatible with MCS-51 Products • 8K Bytes of In-System Reprogrammable Flash Memory • • • • • • • • – Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-Level Program Memory Lock 256 x 8-Bit Internal RAM


    Original     		MCS-51TM 16-Bit AT89C52 80C51 80C52 AT89C52-20AI AT89C52-20JI AT89C52-20PI AT89C52-20QI AT89C52-24AC CONTROLLER pin diagram of microcontroller at89c52 MICROCONTROLLER AT89C52 architecture atmel 89c52 atmel at89c52 AT89C52 power port Microcontroller AT89C52 at89c52 external pullups programming 89C52 PDF

    AT89C52

    Abstract: Microcontroller - AT89S52 40 pin diagram atmel 89c52 atmel at89c52 architecture pin detail for atmel 89c52 atmel 89c52 instruction set AT89C52 INSTRUCTION SET AT89C52 power port Microcontroller AT89s52 counter time pin diagram of microcontroller at89c52
    Text: Features • • • • • • • • • • • Compatible with MCS-51 Products 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-bit Internal RAM


    Original     		MCS-51TM 16-bit AT89C52 80C51 80C52 0313H 02/00/xM Microcontroller - AT89S52 40 pin diagram atmel 89c52 atmel at89c52 architecture pin detail for atmel 89c52 atmel 89c52 instruction set AT89C52 INSTRUCTION SET AT89C52 power port Microcontroller AT89s52 counter time pin diagram of microcontroller at89c52 PDF

    atmel 89c52

    Abstract: atmel at89c52 architecture atmel at89c52 pin detail for atmel 89c52 MICROCONTROLLER AT89C51 pin diagram pin diagram of microcontroller at89c52 AT89C52 INSTRUCTION SET CIRCUIT DIAGRAM FOR AT89C52 AT89C51 INSTRUCTIONS SET atmel AT89C52 PROGRAMMER
    Text: Features • • • • • • • • • • • Compatible with MCS-51 Products 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-Bit Internal RAM


    Original     		MCS-51TM 16-bit AT89C52 80C51 80C52 0313G 04/99/xM atmel 89c52 atmel at89c52 architecture atmel at89c52 pin detail for atmel 89c52 MICROCONTROLLER AT89C51 pin diagram pin diagram of microcontroller at89c52 AT89C52 INSTRUCTION SET CIRCUIT DIAGRAM FOR AT89C52 AT89C51 INSTRUCTIONS SET atmel AT89C52 PROGRAMMER PDF

    atmel AT89C52 PROGRAMMER

    Abstract: pin diagram of microcontroller at89c52 t89c51 AT89C52-20JC AT89C52 INSTRUCTION SET "8-Bit Microcontroller" AT89C52 80C51 80C52 AT89C51 MCS-51
    Text: Features • • • • • • • • • • • Compatible with MCS-51 Products 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-Bit Internal RAM


    Original     		MCS-51TM 16-bit AT89C52 80C51 80C52 44-lead, MS-022 atmel AT89C52 PROGRAMMER pin diagram of microcontroller at89c52 t89c51 AT89C52-20JC AT89C52 INSTRUCTION SET "8-Bit Microcontroller" AT89C52 AT89C51 MCS-51 PDF

    Untitled

    Abstract: No abstract text available
    Text: Features Compatible with MCS-51 Products 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-Bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters


    OCR Scan     		MCS-51â 16-bit AT89C52 80C51 80C52 40-lead, 44-lead, S-022 PDF

    AT89C52 INSTRUCTION SET

    Abstract: "8-Bit Microcontroller" AT89C52 at89c52 full instruction set CIRCUIT DIAGRAM FOR AT89C52 atmel at89c52 architecture interrupts in embedded system at89c52 Microcontroller AT89C51 architecture atmel 89c52 AT89C51 INSTRUCTIONS SET AT89C52
    Text: AT89C52 Features • • • • • • • • • • Compatible with MCS-51TM Products 8 Kbytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-Level Program Memory Lock 256 x 8-Bit Internal RAM


    Original     		AT89C52 MCS-51TM 16-Bit AT89C52 80C51 80C52 AT89C52-24AC AT89C52-24JC AT89C52-24PC AT89C52-24QC AT89C52 INSTRUCTION SET "8-Bit Microcontroller" AT89C52 at89c52 full instruction set CIRCUIT DIAGRAM FOR AT89C52 atmel at89c52 architecture interrupts in embedded system at89c52 Microcontroller AT89C51 architecture atmel 89c52 AT89C51 INSTRUCTIONS SET PDF

    AT89C52 INSTRUCTION SET

    Abstract: CIRCUIT DIAGRAM FOR AT89C52 atmel at89c52 at89c52 full instruction set pin diagram of microcontroller at89c52 AT89C52 power port atmel 89c52 AT89C52 specification AT89C52 INSTRUCTIONS SET atmel at89c52 architecture
    Text: Features • • • • • • • • • • Compatible with MCS-51TM Products 8 Kbytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-Level Program Memory Lock 256 x 8-Bit Internal RAM


    Original     		MCS-51TM 16-Bit AT89C52 80C51 80C52 AT89C52-24AC AT89C52-24JC AT89C52-24PC AT89C52-24QC AT89C52-24AI AT89C52 INSTRUCTION SET CIRCUIT DIAGRAM FOR AT89C52 atmel at89c52 at89c52 full instruction set pin diagram of microcontroller at89c52 AT89C52 power port atmel 89c52 AT89C52 specification AT89C52 INSTRUCTIONS SET atmel at89c52 architecture PDF

    RCA SK CROSS-REFERENCE

    Abstract: power switch transistor dk51 SAB8051A-P all 89c51 microcontroller references book DL1414 Free Projects with assembly language 8086 Atmel PART DATE CODE at25c04 at89c52 base clock circuit diagram free assembly language and assembler of AT89C52 programmer p87c51
    Text: MICROCONTROLLER DATA BOOK Atmel Corporation Microcontroller Data Book October 1995 ¿[¡¡¡EL is the registered trademark of Atmel Corporation 2125 O’Nel Drive, San Jose, CA 95131 Im portant N otice Atmel guarantees that its circuits will be free from defects of material and workmanship under


    OCR Scan     		PDF

    AT89c52 specification

    Abstract: CIRCUIT DIAGRAM FOR AT89C52 AT89C52 INSTRUCTION SET AT89C51 lock bit pin diagram of microcontroller at89c52 IMIT TR2 1BOi ic at89c52 atmel 89c52 atmel at89c52 architecture
    Text: n o h o o z -J o t-o iu -t K X -tiK e •V I AT89C52 " J o l I I -O o 2 J o ttd o 2 Features • • • • • • • • • • Compatible with MCS-51 Products 8 Kbytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles


    OCR Scan     		70/-O/if T0f-02fcJ MCS-51â 16-Bit AT89C52 80C51 AT89C52-20AI AT89C52-20JI AT89C52-20PI AT89C52-20QI AT89c52 specification CIRCUIT DIAGRAM FOR AT89C52 AT89C52 INSTRUCTION SET AT89C51 lock bit pin diagram of microcontroller at89c52 IMIT TR2 1BOi ic at89c52 atmel 89c52 atmel at89c52 architecture PDF

    ic at89c52

    Abstract: IC 89c52 AT89C52 INSTRUCTION SET atmel at89c52 architecture pin diagram of microcontroller at89c52
    Text: Features * * * * * * * * * * * Compatible with MCS-51 Products 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-Bit Internal RAM 32 Programmable I/O Lines


    OCR Scan     		MCS-51TM 16-bit AT89C52 80C51 80C52 ic at89c52 IC 89c52 AT89C52 INSTRUCTION SET atmel at89c52 architecture pin diagram of microcontroller at89c52 PDF

    at89c52 full instruction set

    Abstract: AT89C52 specification interrupts in embedded system at89c52 AT89C52 INSTRUCTIONS SET atmel at89c52 architecture AT89C52-24PI 80C51 80C52 AT89C51 MCS-51
    Text: AT89C52 Features • • • • • • • • • • Compatible with MCS-51 Products 8 Kbytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-Level Program Memory Lock 256 x 8-Bit Internal RAM


    OCR Scan     		AT89C52 MCS-51â 16-Bit 80C51 80C52 at89c52 full instruction set AT89C52 specification interrupts in embedded system at89c52 AT89C52 INSTRUCTIONS SET atmel at89c52 architecture AT89C52-24PI AT89C51 MCS-51 PDF