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    AT89S52 SPECIFICATION Search Results

    AT89S52 SPECIFICATION Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    D82C284-8 Rochester Electronics LLC 82C284 - Processor Specific Clock Generator, 16MHz, CMOS, CDIP18 Visit Rochester Electronics LLC Buy
    D82C284-12 Rochester Electronics LLC 82C284 - Processor Specific Clock Generator, 25MHz, CMOS, CDIP18 Visit Rochester Electronics LLC Buy
    TCM3105NL Rochester Electronics LLC TCM3105NL - FSK Modem, PDIP16 Visit Rochester Electronics LLC Buy
    AM79865JC Rochester Electronics LLC AM79865 -Physical Data Transmitter Visit Rochester Electronics LLC Buy
    AM79866AJC-G Rochester Electronics LLC AM79866A - Physical Data Receiver Visit Rochester Electronics LLC Buy

    AT89S52 SPECIFICATION Datasheets Context Search

    Catalog Datasheet Type Document Tags PDF

    Microcontroller AT89S52 40 pin instructions

    Abstract: 89s52 instruction set Microcontroller - AT89S52 40 pin diagram atmel 89s52 AT89S52 INSTRUCTION SET AT89S52 specification microcontroller Microcontroller - AT89s52 Microcontroller - AT89S52 block diagram 89s52 microcontroller 89s52 interrupt vector table
    Text: 2002-07-04 PRODUKTINFORMATION Vi reserverar oss mot fel samt förbehåller oss rätten till ändringar utan föregående meddelande ELFA artikelnr 73-340-30 AT89S52-24AI 73-340-48 AT89S52-24JI 73-340-55 AT89S52-24PI Features • Compatible with MCS-51 Products


    Original     		AT89S52-24AI AT89S52-24JI AT89S52-24PI MCS-51® 16-bit MCS-51 919A-07/01/xM Microcontroller AT89S52 40 pin instructions 89s52 instruction set Microcontroller - AT89S52 40 pin diagram atmel 89s52 AT89S52 INSTRUCTION SET AT89S52 specification microcontroller Microcontroller - AT89s52 Microcontroller - AT89S52 block diagram 89s52 microcontroller 89s52 interrupt vector table PDF

    of Atmel AT89s52

    Abstract: ATMEL 020 atmel at89s52 AT89s52 at89s52 specification AT89S51 errata of at89s52 AT89S51 ATMEL smart card
    Text: This Errata Sheet is applicable to the following devices: • AT89S51 • AT89S52 The following are known problems with Rev. D of the AT89S51/AT89S52 E.S. Engineering Sample devices: 1. Serial (In-System) Programming In the Serial Programming mode, there is a need for over-programming in the byte


    Original     		AT89S51 AT89S52 AT89S51/AT89S52 07/01/xM of Atmel AT89s52 ATMEL 020 atmel at89s52 AT89s52 at89s52 specification AT89S51 errata of at89s52 AT89S51 ATMEL smart card PDF

    AT89LP52 Drop-In Replacement of AT89S52

    Abstract: AT89S52 INSTRUCTION SET atmel 89s52 89S52 89s52 microcontroller 89s52 instruction set pin of Atmel AT89s52 Microcontroller AT89S52 9 pin microcontroller at 89s52 at 89s52 microcontroller
    Text: AT89LP52 Drop-In Replacement of AT89S52 Features • • • • • ISP Flash Programming 12 Clock Instruction Compatibility Mode Compatibility Mode Configuration Fuses Polarity-selectable Reset using the former External Access EA pin Modified and New SFR registers


    Original     		AT89LP52 AT89S52 AT89S52/AT89LS52 AT89S52" AT89S52 AT89S52, AT89LP52 Drop-In Replacement of AT89S52 AT89S52 INSTRUCTION SET atmel 89s52 89S52 89s52 microcontroller 89s52 instruction set pin of Atmel AT89s52 Microcontroller AT89S52 9 pin microcontroller at 89s52 at 89s52 microcontroller PDF

    Migrating from AT89S52 to AT89LP52

    Abstract: AT89S52 INSTRUCTION SET crystal oscillator 11.0592 mhz in at89s52 AT89S52 specification flash programmer circuit for AT89s52 AT89S52 specification microcontroller Microcontroller AT89s52 counter time pin of Atmel AT89s52 AT89S52 circuit xtal 11.0592
    Text: Migrating from AT89S52 to AT89LP52 New Features • • • • • • • • • • • • • • • • • • • • • SIngle Clock Cycle per Byte Fetch with 20 MIPS Throughput at 20MHz Clock Frequency 12 Clock Instruction Compatibility Mode 4-level Interrupt Priority


    Original     		AT89S52 AT89LP52 20MHz Migrating from AT89S52 to AT89LP52 AT89S52 INSTRUCTION SET crystal oscillator 11.0592 mhz in at89s52 AT89S52 specification flash programmer circuit for AT89s52 AT89S52 specification microcontroller Microcontroller AT89s52 counter time pin of Atmel AT89s52 AT89S52 circuit xtal 11.0592 PDF

    AT89S52 INSTRUCTION SET

    Abstract: Microcontroller AT89S52 40 pin instructions Microcontroller - AT89S52 40 pin diagram Microcontroller - AT89s52 AT89S52 specification AT89S52 specification microcontroller flash programmer circuit for AT89s52 80C51 AT89S52 Microcontroller - AT89S52 40 pin
    Text: Features • Compatible with MCS -51 Products • 8K Bytes of In-System Programmable ISP Flash Memory • • • • • • • • • • • • • • • • – Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz


    Original     		16-bit 1919C AT89S52 INSTRUCTION SET Microcontroller AT89S52 40 pin instructions Microcontroller - AT89S52 40 pin diagram Microcontroller - AT89s52 AT89S52 specification AT89S52 specification microcontroller flash programmer circuit for AT89s52 80C51 AT89S52 Microcontroller - AT89S52 40 pin PDF

    Microcontroller AT89S52 40 pin instructions

    Abstract: Microcontroller AT89S52 24PU AT89S52 INSTRUCTION SET AT89S52 specification Microcontroller AT89S52 Microcontroller - AT89S52 40 pin diagram CIRCUIT DIAGRAM FOR AT89S52 AT89S52 specification microcontroller at89s52-24ju PLCC Microcontroller - AT89S52
    Text: Features • Compatible with MCS -51 Products • 8K Bytes of In-System Programmable ISP Flash Memory • • • • • • • • • • • • • • • • – Endurance: 10,000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz


    Original     		16-bit 1919D Microcontroller AT89S52 40 pin instructions Microcontroller AT89S52 24PU AT89S52 INSTRUCTION SET AT89S52 specification Microcontroller AT89S52 Microcontroller - AT89S52 40 pin diagram CIRCUIT DIAGRAM FOR AT89S52 AT89S52 specification microcontroller at89s52-24ju PLCC Microcontroller - AT89S52 PDF

    CIRCUIT DIAGRAM FOR AT89S52

    Abstract: AT89S52 INSTRUCTION SET Microcontroller AT89S52 at89s52 interrupt vector table Microcontroller AT89S52 40 pin instructions Microcontroller - AT89S52 40 pin diagram AT89S52 at89s52 specification operation of AT89s52 block diagram microcontroller atmel at89s52
    Text: Features • Compatible with MCS -51 Products • 8K Bytes of In-System Programmable ISP Flash Memory • • • • • • • • • • • • • • • • – Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz


    Original     		16-bit 1919C CIRCUIT DIAGRAM FOR AT89S52 AT89S52 INSTRUCTION SET Microcontroller AT89S52 at89s52 interrupt vector table Microcontroller AT89S52 40 pin instructions Microcontroller - AT89S52 40 pin diagram AT89S52 at89s52 specification operation of AT89s52 block diagram microcontroller atmel at89s52 PDF

    Microcontroller - AT89S52 40 pin diagram

    Abstract: Microcontroller - AT89S52 Microcontroller AT89S52 40 pin instructions Microcontroller - AT89S52 40 pin Microcontroller - AT89S52 block diagram Microcontroller AT89S52 Microcontroller AT89S52 40 pin CIRCUIT DIAGRAM FOR AT89S52 Microcontroller AT89S52 block diagram at89s52 interrupt vector table
    Text: Features • Compatible with MCS-51 Products • 8K Bytes of In-System Programmable ISP Flash Memory • • • • • • • • • • • • • • • – Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz


    Original     		MCS-51® 16-bit AT89S52 1919B Microcontroller - AT89S52 40 pin diagram Microcontroller - AT89S52 Microcontroller AT89S52 40 pin instructions Microcontroller - AT89S52 40 pin Microcontroller - AT89S52 block diagram Microcontroller AT89S52 Microcontroller AT89S52 40 pin CIRCUIT DIAGRAM FOR AT89S52 Microcontroller AT89S52 block diagram at89s52 interrupt vector table PDF

    CONTROLLER

    Abstract: 89s52 microcontroller 89S52 atmel 89s52 atmel 89s52 data sheet 89s52 interrupt vector table Microcontroller AT89S52 40 pin instructions MICROCONTROLLER 89s52 datasheets 89s52 instruction set atmel 89s52 datasheet
    Text: Features • Compatible with MCS-51 Products • 8K Bytes of In-System Programmable ISP Flash Memory • • • • • • • • • • • • • – Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz


    Original     		MCS-51® 16-bit AT89S52 MCS-51 919A-07/01/xM CONTROLLER 89s52 microcontroller 89S52 atmel 89s52 atmel 89s52 data sheet 89s52 interrupt vector table Microcontroller AT89S52 40 pin instructions MICROCONTROLLER 89s52 datasheets 89s52 instruction set atmel 89s52 datasheet PDF

    89s52 microcontroller

    Abstract: 89S52 atmel 89s52 AT89S52 INSTRUCTION SET AT89S52 specification microcontroller 89s52 instruction set AT89S52 specification 89s52 interrupt vector table Microcontroller AT89S52 40 pin instructions Clock circuit of microcontroller 89s52
    Text: Features • Compatible with MCS-51 Products • 8K Bytes of In-System Programmable ISP Flash Memory • • • • • • • • • • • • • – Endurance: 1000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz


    Original     		MCS-51® 16-bit AT89S52 MCS-51 919A-07/01/xM 89s52 microcontroller 89S52 atmel 89s52 AT89S52 INSTRUCTION SET AT89S52 specification microcontroller 89s52 instruction set AT89S52 specification 89s52 interrupt vector table Microcontroller AT89S52 40 pin instructions Clock circuit of microcontroller 89s52 PDF

    AT89S52 specification

    Abstract: AT89S52 specification microcontroller microcontroller atmel at89s52 Microcontroller AT89S52 usb programmer atmel at89c55wd programmer Microcontroller AT89S52 AT89S52 microcontroller atmel AT89C52 PROGRAMMER ic at89s52 ic AT89S51
    Text: LEAPER-5E USB Handy MCS-51 IC Writer Programmer Series A18 Introduction LEAPER-5E is a single-site programmer especially for 8-Bit microcontroller. It is able to support One-Chip programming and various kinds of file type. As that, LEAPER5E reaches the programming demands in


    Original     		MCS-51 2V/500mA PLCC-44 P89C58UB P89C51RC+ P89C51RC2H P89C51RB2 P89C51X2 P89C58X2 P89C54B AT89S52 specification AT89S52 specification microcontroller microcontroller atmel at89s52 Microcontroller AT89S52 usb programmer atmel at89c55wd programmer Microcontroller AT89S52 AT89S52 microcontroller atmel AT89C52 PROGRAMMER ic at89s52 ic AT89S51 PDF

    ic at89c51

    Abstract: ic at89s52 at89s52 specification at89s52 flash programmer circuit for AT89s52 ic AT89S51 atmel at89s52 MCS51 flash programmer circuit for AT89c51 AT89S52 circuit
    Text: LEAPER-5E USB USB HANDY HANDY MCS-51 MCS-51 IC IC WRITER WRITER INTEL 87C51FA 87C51FB 87C51FC 87C51RA 87C51RB 87C51RC 87C52 87C54 87C58 IS89C51 IS89C52 IS89C54 IS89C58 IS89C64 IS89E54 IS89E58 IS89E64 IS89LV51 IS89LV52 IS89C51A IS89C52A IS89LV51A IS89LV52A


    Original     		MCS-51 87C51FA 87C51FB 87C51FC 87C51RA 87C51RB 87C51RC 87C52 87C54 ic at89c51 ic at89s52 at89s52 specification at89s52 flash programmer circuit for AT89s52 ic AT89S51 atmel at89s52 MCS51 flash programmer circuit for AT89c51 AT89S52 circuit PDF

    Application Notes

    Abstract: ELECTRONIC NOTICE BOARD USING AT89S52 circuit Microcontroller AT89S52 microcontroller AT89S51 AT89S52 specification atmel s52 microcontroller AT89S51 PROGRAMMING INTERFACE Microcontroller AT89S52 40 pin Microcontroller AT89s52 datasheet download introduction to microcontroller AT89C52
    Text: Migrating from AT89C51/C52 to AT89S51/S52 Flash Microcontrollers New Features • • • • • • Hardware Watchdog Timer Dual Data Pointer Power-off Flag Interrupt Recovery from Power-down Mode Flexible ISP Programming Byte and Page Modes 42-pin PDIP Package Option for Reduced EMI Emission


    Original     		AT89C51/C52 AT89S51/S52 42-pin AT89S51/S52. AT89LV51/LV52 AT89LS51/LS52. AT89S51/S52 Application Notes ELECTRONIC NOTICE BOARD USING AT89S52 circuit Microcontroller AT89S52 microcontroller AT89S51 AT89S52 specification atmel s52 microcontroller AT89S51 PROGRAMMING INTERFACE Microcontroller AT89S52 40 pin Microcontroller AT89s52 datasheet download introduction to microcontroller AT89C52 PDF

    AT89S52 specification

    Abstract: 80C51 MANUAL MICRO CONTROLLER ATMEL free AT89S52 at89s52 micro controller AUTOMATIC LIGHT CONTROLLER introduction atmel 80c51 pentium 2 ATMEL AT89S52 siemens programming manual
    Text: SU B J E C T T O CH A N G E Programming Systems Software The MCP-x51 is supplied with powerful 32-bit Windows software. The graphical user interface supports easy usage, speed and full functionality. The MCP-x51 software is Windows 98SE / ME / 2000 / XP compatible.


    Original     		MCP-x51 32-bit MCP-x51 80c51 500mA AT89S52 specification 80C51 MANUAL MICRO CONTROLLER ATMEL free AT89S52 at89s52 micro controller AUTOMATIC LIGHT CONTROLLER introduction atmel 80c51 pentium 2 ATMEL AT89S52 siemens programming manual PDF

    operation of AT89s52 block diagram

    Abstract: digital clock using at89s52 microcontroller Microcontroller AT89S52 40 pin instructions 40 pins AT89S52 INSTRUCTION SET AT89S52 INSTRUCTION SET Microcontroller - AT89S52 40 pin diagram AT89LP52 flash programmer circuit for AT89s52 at89s52 interrupt vector table AT89S52 specification microcontroller
    Text: Features • 8-bit Microcontroller Compatible with 8051 Products • Enhanced 8051 Architecture • • • • • – Single Clock Cycle per Byte Fetch – 12 Clock per Machine Cycle Compatibility Mode – Up to 20 MIPS Throughput at 20 MHz Clock Frequency


    Original     		256-byte 64-byte operation of AT89s52 block diagram digital clock using at89s52 microcontroller Microcontroller AT89S52 40 pin instructions 40 pins AT89S52 INSTRUCTION SET AT89S52 INSTRUCTION SET Microcontroller - AT89S52 40 pin diagram AT89LP52 flash programmer circuit for AT89s52 at89s52 interrupt vector table AT89S52 specification microcontroller PDF

    4052 Primer

    Abstract: AT89C2051 microcontroller interrupt source and its vector address 7 segment use at89c2051 clock 7 segment use at89c2051 AT89ISP atmel 8051 sample code AT89S52 INSTRUCTION SET Microcontroller - AT89s52 AT25C040 serial communication with AT89c2051
    Text: AT89LP2052/4052 Primer 1. Introduction The Atmel AT89LP2052/4052 microcontroller is a low-power, high-performance device featuring an enhanced single-cycle 8051 CPU, 2K/4K bytes of Flash memory, 256 bytes of RAM, configurable I/O, an analog comparator, dual pulse width modulation PWM outputs, a UART, a Serial Peripheral Interface (SPI) and a watchdog


    Original     		AT89LP2052/4052 AT89C2051/4051 AT89C2051document 4052 Primer AT89C2051 microcontroller interrupt source and its vector address 7 segment use at89c2051 clock 7 segment use at89c2051 AT89ISP atmel 8051 sample code AT89S52 INSTRUCTION SET Microcontroller - AT89s52 AT25C040 serial communication with AT89c2051 PDF

    PLC44

    Abstract: vqfp44 ic at89c51 REAL TIME CLOCK with AT89s52 at89s8252 real time clock AT89S51 I2C ic AT89S51 ic at89s52 at89s51 digital clock program for digital clock AT89C51
    Text: C51 M ICROCONTROLLERS SELECTION GUIDE FLASH OTP ROM ROMLESS A P P L I C AT I O N S P E C I F I C AT M E L GENERAL PURPOSE C51 KB y r o B) ) em M M (K ytes m O B ( ns a r R Pi RT M og EP A O r E UA I/ R P s er Tim AT89S51 4 128 32 1 2 WDT 4.0 - 5.5 33 AT89LS51


    Original     		AT89S51 AT89LS51 PDIP40, PLCC44, TQFP44 AT89S52 AT89LS52 PLC44 vqfp44 ic at89c51 REAL TIME CLOCK with AT89s52 at89s8252 real time clock AT89S51 I2C ic AT89S51 ic at89s52 at89s51 digital clock program for digital clock AT89C51 PDF

    atmeL AT89CX051 PIN DIAGRAM

    Abstract: WDTCON Microcontroller - AT89S52 block diagram AT89CX051 PIN DIAGRAM AT25C04 AT89s52 operation of AT89s52 block diagram AT25C040 spi at89s8253 Microcontroller AT89S52 block diagram
    Text: AT89S8253 Primer 1. Introduction The Atmel AT89S8253 microcontroller is a low-power, high-performance device featuring 12K bytes of Flash memory, 2K bytes of EEPROM, and a Serial Peripheral Interface SPI . The Flash and EEPROM memories may be reprogrammed in-system


    Original     		AT89S8253 AT89S8252 AT89S53 3655B atmeL AT89CX051 PIN DIAGRAM WDTCON Microcontroller - AT89S52 block diagram AT89CX051 PIN DIAGRAM AT25C04 AT89s52 operation of AT89s52 block diagram AT25C040 spi at89s8253 Microcontroller AT89S52 block diagram 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

    AVRISP mkII

    Abstract: avrisp atiny2313 AT89S52 usb programmer circuit ATtiny13 code examples serial communication at89s51 avrstudio4 for at89s51 avr isp programmer schematic Atmel technical library AVR Studio
    Text: AVRISP mkII User Guide See AVR Studio 4 online help for updated and complete information. Introduction • Introduction • Getting Started • Software and USB Setup • Supported Devices Frontend Software • Using AVR Studio with AVRISP mkII - Program - Fuses


    Original     		PDF

    CIRCUIT DIAGRAM FOR AT89S52

    Abstract: AT89S8253 AT89S52 data sheet MICROCONTROLLER AT89S51 pin diagram Microcontroller AT89S52 40 pin MCS-51 flash programmer circuit for AT89s52 operation of AT89s52 block diagram Microcontroller AT89S52 40 pin diagram 8051 edge detection
    Text: Features • Compatible with MCS -51 Products • 12K Bytes of In-System Programmable ISP Flash Program Memory • • • • • • • • • • • • • • • • • • • • • – SPI Serial Interface for Program Downloading – Endurance: 10,000 Write/Erase Cycles


    Original     		64-byte 16-bit CIRCUIT DIAGRAM FOR AT89S52 AT89S8253 AT89S52 data sheet MICROCONTROLLER AT89S51 pin diagram Microcontroller AT89S52 40 pin MCS-51 flash programmer circuit for AT89s52 operation of AT89s52 block diagram Microcontroller AT89S52 40 pin diagram 8051 edge detection PDF

    Microcontroller - AT89S52 40 pin diagram

    Abstract: CIRCUIT DIAGRAM FOR AT89S52 Microcontroller AT89S52 at89s52 interrupt vector table at89s52 serial com using T2 Microcontroller AT89S52 block diagram at89s52 specification Microcontroller AT89S52 40 pin MICROCONTROLLER AT89C51 pin diagram Microcontroller AT89s52 datasheet download
    Text: Features • • • • • • • • • • Compatible with MCS-51 Products 8K Bytes of User Programmable QuickFlash™ Memory Fully Static Operation: 0 Hz to 24 MHz Three-Level Program Memory Lock 256 x 8-Bit Internal RAM 32 Programmable I/O Lines


    Original     		MCS-51TM 16-Bit AT87F52 80C51 80C52 02/98/15M Microcontroller - AT89S52 40 pin diagram CIRCUIT DIAGRAM FOR AT89S52 Microcontroller AT89S52 at89s52 interrupt vector table at89s52 serial com using T2 Microcontroller AT89S52 block diagram at89s52 specification Microcontroller AT89S52 40 pin MICROCONTROLLER AT89C51 pin diagram Microcontroller AT89s52 datasheet download PDF

    Microcontroller AT89S52

    Abstract: at89s52 specification ELECTRONIC NOTICE BOARD USING AT89S52 circuit atmel 8051 42-PIN AT89S52 AT89S52 data sheet CIRCUIT DIAGRAM FOR AT89S52 flash programmer circuit for AT89s51 Microcontroller AT89S51 Microcontroller AT89S52 40 pin
    Text: Features • Compatible with MCS -51 Products • 12K Bytes of In-System Programmable ISP Flash Program Memory • • • • • • • • • • • • • • • • • • • • • – SPI Serial Interface for Program Downloading – Endurance: 10,000 Write/Erase Cycles


    Original     		64-byte 16-bit 3286B Microcontroller AT89S52 at89s52 specification ELECTRONIC NOTICE BOARD USING AT89S52 circuit atmel 8051 42-PIN AT89S52 AT89S52 data sheet CIRCUIT DIAGRAM FOR AT89S52 flash programmer circuit for AT89s51 Microcontroller AT89S51 Microcontroller AT89S52 40 pin PDF

    at89s52

    Abstract: AT89S8253 DOC4316 AT89S8253-24PU Microcontroller AT89S51 MCS-51 CIRCUIT DIAGRAM FOR AT89S52 spi at89s8253 Microcontroller AT89S52 40 pin instructions
    Text: Features • Compatible with MCS -51 Products • 12K Bytes of In-System Programmable ISP Flash Program Memory • • • • • • • • • • • • • • • • • • • • • • – SPI Serial Interface for Program Downloading – Endurance: 10,000 Write/Erase Cycles


    Original     		64-byte 16-bit 3286H at89s52 AT89S8253 DOC4316 AT89S8253-24PU Microcontroller AT89S51 MCS-51 CIRCUIT DIAGRAM FOR AT89S52 spi at89s8253 Microcontroller AT89S52 40 pin instructions PDF