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    TIMER USING AT89C2051 Search Results

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    Part ECAD Model Manufacturer Description Download Buy
    N82C54-2 Rochester Electronics LLC Programmable Timer, CMOS Visit Rochester Electronics LLC Buy
    P82C54-2 Rochester Electronics LLC Programmable Timer, CMOS Visit Rochester Electronics LLC Buy
    MC6840CFN-G Rochester Electronics LLC MC6840 - Programmable Timer Module(PTM) Visit Rochester Electronics LLC Buy
    MC6840CP-G Rochester Electronics LLC MC6840 - Programmable Timer Module(PTM) Visit Rochester Electronics LLC Buy
    MR8254/R Rochester Electronics LLC 8254 - Programmable Interval Timer Visit Rochester Electronics LLC Buy

    TIMER USING AT89C2051 Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    11.0592 CRYSTAL used in microcontroller at89c52

    Abstract: AT89C51 Crystal oscillator 12 MHz 7 segment use at89c2051 AT89C51 INSTRUCTIONS SET 11.0592 CRYSTAL used in microcontroller at89c51 p AT89C51 INSTRUCTION SET 11.0592 CRYSTAL used in microcontroller at89c51 clock 7 segment use at89c2051 AT89C2051 internal RAM memory map Microcontroller - AT89C2051 pin diagram
    Text: The information presented in this chapter is collected from the Microcontroller Architectural Overview, AT89C51, AT89LV51, AT89C52, AT89LV52, AT89C2051, and AT89C1051 data sheets of this book. The material has been selected and rearranged to form a quick and convenient reference for the programmers of Atmel’s microcontroller family of devices. This guide pertains specifically to the AT89C51, AT89LV51,


    Original     		PDF AT89C51, AT89LV51, AT89C52, AT89LV52, AT89C2051, AT89C1051 AT89LV52. 11.0592 CRYSTAL used in microcontroller at89c52 AT89C51 Crystal oscillator 12 MHz 7 segment use at89c2051 AT89C51 INSTRUCTIONS SET 11.0592 CRYSTAL used in microcontroller at89c51 p AT89C51 INSTRUCTION SET 11.0592 CRYSTAL used in microcontroller at89c51 clock 7 segment use at89c2051 AT89C2051 internal RAM memory map Microcontroller - AT89C2051 pin diagram

    MICROCONTROLLER AT89C51 pin diagram

    Abstract: 11.0592 CRYSTAL used in microcontroller at89c51 11.0592 CRYSTAL used in microcontroller at89c52 7 segment use at89c51 AT89C51 INSTRUCTIONS SET Microcontroller AT89C2051 instruction set 2051 atmel clock 7 segment use at89c2051 flash programmer circuit for AT89c2051 AT89C51 INSTRUCTION SET
    Text: Memory Organization The information presented in this chapter is collected from the Microcontroller Architectural Overview, AT89C51, AT89LV51, AT89C52, AT89LV52, AT89C2051, and AT89C1051 data sheets of this book. The material has been selected and rearranged to form a quick and


    Original     		PDF AT89C51, AT89LV51, AT89C52, AT89LV52, AT89C2051, AT89C1051 AT89LV52. MICROCONTROLLER AT89C51 pin diagram 11.0592 CRYSTAL used in microcontroller at89c51 11.0592 CRYSTAL used in microcontroller at89c52 7 segment use at89c51 AT89C51 INSTRUCTIONS SET Microcontroller AT89C2051 instruction set 2051 atmel clock 7 segment use at89c2051 flash programmer circuit for AT89c2051 AT89C51 INSTRUCTION SET

    LP4052

    Abstract: serial communication with AT89c2051 AT89C2051 PWM GENERATOR AT89C2051 microcontroller interrupt timer code Microcontroller AT89C2051 pin function AT89C2051 timer application AT89C2051 PROGRAMMING INTERFACE AT89c2051 Analog AT89C2051 microcontroller interrupt AT89C2051 internal memory map
    Text: Migrating from AT89C2051/C4051 to AT89LP2052/LP4052 New Features • • • • • • • • • • • • • • • • • 20 MIPS throughput at 20 MHz Clock Frequency and 2.7V, 85° C Operating Conditions Single Clock Cycle per Byte Fetch Serial Interface for Program Downloading


    Original     		PDF AT89C2051/C4051 AT89LP2052/LP4052 32-byte 16-bit 3573B LP4052 serial communication with AT89c2051 AT89C2051 PWM GENERATOR AT89C2051 microcontroller interrupt timer code Microcontroller AT89C2051 pin function AT89C2051 timer application AT89C2051 PROGRAMMING INTERFACE AT89c2051 Analog AT89C2051 microcontroller interrupt AT89C2051 internal memory map

    serial communication with AT89c2051

    Abstract: AT89C2051 internal RAM memory map AT89C2051 PROGRAMMING INTERFACE AT89C2051 internal memory map AT89C2051 microcontroller interrupt timer code AT89c2051 Application Note AT89C2051 microcontroller interrupt 8051 UART Program Examples AT89C2051 pin function Microcontroller AT89C2051 pin function
    Text: Migrating from AT89C2051/C4051 to AT89LP2052/LP4052 New Features • • • • • • • • • • • • • • • • • 20 MIPS throughput at 20 MHz Clock Frequency and 2.7V, 85°C Operating Conditions Single Clock Cycle per Byte Fetch Serial Interface for Program Downloading


    Original     		PDF AT89C2051/C4051 AT89LP2052/LP4052 32-byte 16-bit serial communication with AT89c2051 AT89C2051 internal RAM memory map AT89C2051 PROGRAMMING INTERFACE AT89C2051 internal memory map AT89C2051 microcontroller interrupt timer code AT89c2051 Application Note AT89C2051 microcontroller interrupt 8051 UART Program Examples AT89C2051 pin function Microcontroller AT89C2051 pin function

    flash programmer circuit for AT89c2051

    Abstract: Microcontroller AT89C2051 instruction set pin configuration of 89c2051 led interface with 89C2051 89C2051 AT89C2051 microcontroller interrupt timer code Microcontroller AT89C2051 programming 89C2051 at89c2051 datasheet atmel 89c2051 datasheet
    Text: AT89C2051 Features • • • • • • • • • • • • • Compatible with MCS-51  Products 2 Kbytes of Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles 2.7 V to 6 V Operating Range Fully Static Operation: 0 Hz to 24 MHz Two-Level Program Memory Lock


    Original     		PDF AT89C2051 MCS-51TM 16-Bit AT89C2051 AT89C2051-12PC AT89C2051-12SC AT89C2051-24PC AT89C2051-24SC flash programmer circuit for AT89c2051 Microcontroller AT89C2051 instruction set pin configuration of 89c2051 led interface with 89C2051 89C2051 AT89C2051 microcontroller interrupt timer code Microcontroller AT89C2051 programming 89C2051 at89c2051 datasheet atmel 89c2051 datasheet

    Microcontroller - AT89C2051 instruction set

    Abstract: Microcontroller - AT89C2051 pin diagram AT89C2051 microcontroller flash programmer circuit for AT89c2051 programming 89C2051 AT89C2051 PROGRAMMING INTERFACE led interface with 89C2051 pin diagram of AT89c2051 microcontroller 89c2051 ATmel AT89C2051 lock bit
    Text: AT89C2051 Features • • • • • • • • • • • • • Compatible with MCS-51  Products 2 Kbytes of Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles 2.7 V to 6 V Operating Range Fully Static Operation: 0 Hz to 24 MHz Two-Level Program Memory Lock


    Original     		PDF AT89C2051 MCS-51TM 16-Bit AT89C2051 AT89C2051-12PC AT89C2051-12SC AT89C2051-24PC AT89C2051-24SC Microcontroller - AT89C2051 instruction set Microcontroller - AT89C2051 pin diagram AT89C2051 microcontroller flash programmer circuit for AT89c2051 programming 89C2051 AT89C2051 PROGRAMMING INTERFACE led interface with 89C2051 pin diagram of AT89c2051 microcontroller 89c2051 ATmel AT89C2051 lock bit

    8051 interfacing with adc pcf8591

    Abstract: keypad 4x4 c code for 8051 IC 74c922 keypad 4x4 matrix c code for 8051 74C922 74C922 PCF8574 at24C04 code example assembly interfacing 24c04 with 8051 with lcd datasheet keypad 4x4 74c922 lcd interface with at89c2051
    Text: Two-Wire Peripheral Expansion for the AT89C2051 Microcontroller The attribute shared by most embedded controllers is their ability to interact with the outside world. While this fact is generally accepted, the form this I/O takes includes everything from parallel and bitaddressable digital I/O, analog I/O, as


    Original     		PDF AT89C2051 8051 interfacing with adc pcf8591 keypad 4x4 c code for 8051 IC 74c922 keypad 4x4 matrix c code for 8051 74C922 74C922 PCF8574 at24C04 code example assembly interfacing 24c04 with 8051 with lcd datasheet keypad 4x4 74c922 lcd interface with at89c2051

    S4051

    Abstract: AT89S051 serial communication with AT89c2051 AT89c2051 Application Note AT89c2051 Analog AT89C2051 microcontroller interrupt AT89C2051 microcontroller interrupt timer code AT89C2051 microcontroller AT89S2051 AT89C2051 internal memory map
    Text: Migrating from AT89C2051/C4051 to AT89S2051/S4051 Flash Microcontrollers New Features • 8-bit Pulse-width Modulation • Enhanced UART Serial Port with Framing Error Detection and Automatic • • • • • • • • • Address Recognition On-chip Analog Comparator with Selectable Interrupt


    Original     		PDF AT89C2051/C4051 AT89S2051/S4051 AT89S2051/S4051. S4051 AT89S051 serial communication with AT89c2051 AT89c2051 Application Note AT89c2051 Analog AT89C2051 microcontroller interrupt AT89C2051 microcontroller interrupt timer code AT89C2051 microcontroller AT89S2051 AT89C2051 internal memory map

    AT24C04 with AT89C2051

    Abstract: interfacing 24c04 with 8051 with lcd 74C922 IC 74c922 lcd interface with at89c2051 AT89C2051 microcontroller 20 pin ic i2c interfacing with 8051 Interfacing RTC using I2C protocol INTERFACING MEMORY WITH 8051 THROUGH I2C PROTOCOL 24C04 code example assembly
    Text: Two-Wire Peripheral Expansion for the AT89C2051 Microcontroller The attribute shared by most embedded controllers is their ability to interact with the outside world. While this fact is generally accepted, the form this I/O takes includes everything from parallel and bitaddressable digital I/O, analog I/O, as


    Original     		PDF AT89C2051 AT24C04 with AT89C2051 interfacing 24c04 with 8051 with lcd 74C922 IC 74c922 lcd interface with at89c2051 AT89C2051 microcontroller 20 pin ic i2c interfacing with 8051 Interfacing RTC using I2C protocol INTERFACING MEMORY WITH 8051 THROUGH I2C PROTOCOL 24C04 code example assembly

    MUX 74157

    Abstract: CMOS 4011 AT89C2051 MICROCONTROLLER cmos 4040 74157 mux Microcontroller - AT89C2051 instruction set WE Y1 P3_6 DAQS panel-meter Microcontroller AT89C2051
    Text: PC-Interfaced Data Acquisition System with the Atmel AT89C2051 Microcontroller Introduction The features of the Atmel AT89C2051 microcontroller offer the user the chance to achieve a very low-cost/performance data acquisition system DAQS for low-frequency applications.


    Original     		PDF AT89C2051 AT89C2051 MUX 74157 CMOS 4011 AT89C2051 MICROCONTROLLER cmos 4040 74157 mux Microcontroller - AT89C2051 instruction set WE Y1 P3_6 DAQS panel-meter Microcontroller AT89C2051

    AT89LP6440

    Abstract: at89lp programmer Microcontroller - AT89s52 flash programmer circuit for AT89c2051 80C51 at89c52 flash programmers flash memory programming circuit for AT89s52 isp programmer circuit for AT89c2051 AT89S2
    Text: Features • 8-bit Microcontroller Compatible with MCS 51 Products • Enhanced 8051 Architecture • • • • • – Single-clock Cycle per Byte Fetch – Up to 20 MIPS Throughput at 20 MHz Clock Frequency – Fully Static Operation: 0 Hz to 20 MHz – On-chip 2-cycle Hardware Multiplier


    Original     		PDF 16x16 256x8 4096x8 64-byte 256-Byte 3706B AT89LP6440 at89lp programmer Microcontroller - AT89s52 flash programmer circuit for AT89c2051 80C51 at89c52 flash programmers flash memory programming circuit for AT89s52 isp programmer circuit for AT89c2051 AT89S2

    Untitled

    Abstract: No abstract text available
    Text: Features • 8-bit Microcontroller Compatible with MCS 51 Products • Enhanced 8051 Architecture • • • • • – Single-clock Cycle per Byte Fetch – Up to 20 MIPS Throughput at 20 MHz Clock Frequency – Fully Static Operation: 0 Hz to 20 MHz – On-chip 2-cycle Hardware Multiplier


    Original     		PDF 16x16 256x8 4096x8 32K/64K 3706Câ

    OPCODE FOR Digital lock using AT89C2051

    Abstract: Microcontroller - AT89S52 40 pin AT89S52 specification microcontroller abstract for digital watch using at89s52 at89s2051 pwm at89c2051 architecture details at89s52 development board MO-220 8x8 68 80C51 AT89LP6440
    Text: Features • 8-bit Microcontroller Compatible with MCS 51 Products Enhanced 8051 Architecture – Single-clock Cycle per Byte Fetch – Up to 20 MIPS Throughput at 20 MHz Clock Frequency – Fully Static Operation: 0 Hz to 20 MHz – On-chip 2-cycle Hardware Multiplier


    Original     		PDF 16x16 256x8 4096x8 64-byte 256-Byte OPCODE FOR Digital lock using AT89C2051 Microcontroller - AT89S52 40 pin AT89S52 specification microcontroller abstract for digital watch using at89s52 at89s2051 pwm at89c2051 architecture details at89s52 development board MO-220 8x8 68 80C51 AT89LP6440

    at89lp3240

    Abstract: Delta DPS 300 RP -2 C REV AT89LP6440 8051s Microcontroller AT89S52 atmel AT89LP6440 sample code at89lp programmer interface at89s2051 pwm serial communication with AT89c2051 digital clock using at89s52 microcontroller
    Text: Features • 8-bit Microcontroller Compatible with MCS 51 Products • Enhanced 8051 Architecture • • • • • – Single-clock Cycle per Byte Fetch – Up to 20 MIPS Throughput at 20 MHz Clock Frequency – Fully Static Operation: 0 Hz to 20 MHz – On-chip 2-cycle Hardware Multiplier


    Original     		PDF 16x16 256x8 4096x8 32K/64K 64-byte 256LOSS 3706C at89lp3240 Delta DPS 300 RP -2 C REV AT89LP6440 8051s Microcontroller AT89S52 atmel AT89LP6440 sample code at89lp programmer interface at89s2051 pwm serial communication with AT89c2051 digital clock using at89s52 microcontroller

    80C2051

    Abstract: 8051 vs pic microcontroller atmel 8051 microcontroller with built in ADC PIC lead acid battery charger maxim 8051 microcontroller with built in ADC abstract for battery level indicator gas sensor using 8051 write 8051 adc using simple program pin diagram 80C2051 AT89C2051 microcontroller interrupt timer code
    Text: Maxim > App Notes > BATTERY MANAGEMENT POWER-SUPPLY CIRCUITS Keywords: linear, switch-mode, battery charger, microcontroller, current source, switching dc-dc converter, notebook computer, lithium-ion, Li+, lithium, 8051, NiCd, NiMH, Nickel Metal Hydride, Microchip PIC, voltage


    Original     		PDF and680 MAX1640: MAX1926: MAX712: MAX713: MAX745: MAX846A: AN680, APP680, Appnote680, 80C2051 8051 vs pic microcontroller atmel 8051 microcontroller with built in ADC PIC lead acid battery charger maxim 8051 microcontroller with built in ADC abstract for battery level indicator gas sensor using 8051 write 8051 adc using simple program pin diagram 80C2051 AT89C2051 microcontroller interrupt timer code

    80C2051

    Abstract: PIC lead acid battery charger atmel 80c2051 METAL DETECTOR using 8051 microcontroller PIC based metal detector system interfacing 8051 with metal detector 8051 vs pic microcontroller ATMEL APPLICATIONS JOURNAL pin diagram 80C2051 dac interfacing with 8051 microcontroller free do
    Text: Maxim > App Notes > Battery Management Power- Supply Circuits Jul 22, 2002 Keywords: linear, switch- mode, battery charger, microcontroller, current source, switching dc- dc converter, notebook computer, lithium - ion, Li+, lithium, 8051, NiCd, NiMH, Nickel Metal Hydride, Microchip PIC, voltage regulator, current regulators


    Original     		PDF MAX713: MAX745: MAX846A: com/an680 AN680, APP680, Appnote680, 80C2051 PIC lead acid battery charger atmel 80c2051 METAL DETECTOR using 8051 microcontroller PIC based metal detector system interfacing 8051 with metal detector 8051 vs pic microcontroller ATMEL APPLICATIONS JOURNAL pin diagram 80C2051 dac interfacing with 8051 microcontroller free do

    AT8952

    Abstract: at89c52 base clock circuit diagram at89c52 base clock circuit diagram free at89c52 base clock Microcontroller AT89C2051 instruction set AT89C51 hardware interfacing AT89C51 INSTRUCTIONS SET at89c52 base clock circuit at89 programmer MICROCONTROLLER AT89C51 pin diagram
    Text: AT89 Series Hardware Description Introduction This chapter presents a comprehensive description of the on-chip hardware features of Atmel’s Flash-based microcontrollers. Included in this description are the following items. • The port drivers and how they function both as ports and, for Ports 0 and 2,


    Original     		PDF AT89C51 AT89C52. 16-bit AT8952 at89c52 base clock circuit diagram at89c52 base clock circuit diagram free at89c52 base clock Microcontroller AT89C2051 instruction set AT89C51 hardware interfacing AT89C51 INSTRUCTIONS SET at89c52 base clock circuit at89 programmer MICROCONTROLLER AT89C51 pin diagram

    at89c52 base clock

    Abstract: at89c52 base clock circuit diagram AT89C52 TIMER0 AT89C2051 microcontroller interrupt counting code at89c52 base clock circuit AT89C51 Interrupt Priority AT89C51 hardware interfacing at89c52 full instruction set introduction to microcontroller AT89C52 at89c52 base clock circuit diagram free
    Text: Introduction This chapter presents a comprehensive description of the on-chip hardware features of Atmel’s Flash-based microcontrollers. Included in this description are the following items. • The port drivers and how they function both as ports and, for Ports 0 and 2, in bus


    Original     		PDF 16-bit AT89C1051 AT89C2051 at89c52 base clock at89c52 base clock circuit diagram AT89C52 TIMER0 AT89C2051 microcontroller interrupt counting code at89c52 base clock circuit AT89C51 Interrupt Priority AT89C51 hardware interfacing at89c52 full instruction set introduction to microcontroller AT89C52 at89c52 base clock circuit diagram free

    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     		PDF 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

    DL1414

    Abstract: circuit diagram of moving LED message display 20 pin at89c2051 DL1414T DL1414* display U.S. Robotics sportster AT89C2051 microcontroller interrupt timer code c language program to count 0-9 for each push AT89Cx051 AT89C2051 MICRO CONTROLLER
    Text: Microcontroller AT89S8252 In-System Programming Introduction This application note illustrates the insystem programmability of the Atmel AT89SXXXX S-series microcontrollers. A method is shown by which an AT89S8252 in an application may be programmed remotely over a standard


    Original     		PDF AT89S8252 AT89SXXXX DL1414 circuit diagram of moving LED message display 20 pin at89c2051 DL1414T DL1414* display U.S. Robotics sportster AT89C2051 microcontroller interrupt timer code c language program to count 0-9 for each push AT89Cx051 AT89C2051 MICRO CONTROLLER

    AT89C2051 microcontroller interrupt counting code

    Abstract: ATmel AT89C2051 lock bit AT89C2051 microcontroller interrupt at89s2051 pwm flash programmer circuit for AT89c2051 at89c2051 architecture details Microcontroller - AT89C2051 pin diagram atmel isp programmer circuit for AT89c2051 AT89C2051 microcontroller serial communication with AT89c2051
    Text: Features • Compatible with MCS 51 Products • 2K/4K Bytes of In-System Programmable ISP Flash Program Memory • • • • • • • • • • • • • • • • • • • • • – Serial Interface for Program Downloading – Endurance: 10,000 Write/Erase Cycles


    Original     		PDF 16-bit 3390E AT89C2051 microcontroller interrupt counting code ATmel AT89C2051 lock bit AT89C2051 microcontroller interrupt at89s2051 pwm flash programmer circuit for AT89c2051 at89c2051 architecture details Microcontroller - AT89C2051 pin diagram atmel isp programmer circuit for AT89c2051 AT89C2051 microcontroller serial communication with AT89c2051

    AT89C2051 microcontroller interrupt counting code

    Abstract: AT89C2051 PIN DIAGRAM AT89S2051 AT89c2051 BASED FREQUENCY COUNTER BSY27 isp programmer circuit for AT89c2051
    Text: Features • Compatible with MCS 51 Products • 2K/4K Bytes of In-System Programmable ISP Flash Program Memory • • • • • • • • • • • • • • • • • • • • • – Serial Interface for Program Downloading – Endurance: 10,000 Write/Erase Cycles


    Original     		PDF 16-bit 3390B AT89C2051 microcontroller interrupt counting code AT89C2051 PIN DIAGRAM AT89S2051 AT89c2051 BASED FREQUENCY COUNTER BSY27 isp programmer circuit for AT89c2051

    at89s2051 pwm

    Abstract: AT89C2051 microcontroller interrupt counting code isp programmer circuit for AT89c2051 AT89S2051 AT89C2051 internal RAM memory map DOC4316 ATmel AT89C2051 lock bit AT89S4051 MCS-51 AT89C2051 microcontroller interrupt timer code
    Text: Features • Compatible with MCS 51 Products • 2K/4K Bytes of In-System Programmable ISP Flash Program Memory • • • • • • • • • • • • • • • • • • • • • – Serial Interface for Program Downloading – Endurance: 10,000 Write/Erase Cycles


    Original     		PDF 16-bit 3390D at89s2051 pwm AT89C2051 microcontroller interrupt counting code isp programmer circuit for AT89c2051 AT89S2051 AT89C2051 internal RAM memory map DOC4316 ATmel AT89C2051 lock bit AT89S4051 MCS-51 AT89C2051 microcontroller interrupt timer code

    20 pin at89c2051 ic

    Abstract: AT89C2051 ic Microcontroller - AT89C2051 pin diagram AT89C2051 microcontroller 20 pin ic at89c2051 instruction set AT89C205I AT89C2051 internal memory map atmel AT89C2051-24PI T89C2051 ic 89c2051
    Text: AT89C2051 Features • • • • • • • • • • • • • Compatible with MCS-51 Products 2 Kbytes of Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles 2.7 V to 6 V Operating Range Fully Static Operation: 0 Hz to 24 MHz Two-Level Program Memory Lock


    OCR Scan     		PDF AT89C2051 MCS-51TM 16-Bit AT89C2051-12PC AT89C2051-12SC AT89C2051-12PI AT89C2051-12SI AT89C2051-24PC 20 pin at89c2051 ic AT89C2051 ic Microcontroller - AT89C2051 pin diagram AT89C2051 microcontroller 20 pin ic at89c2051 instruction set AT89C205I AT89C2051 internal memory map atmel AT89C2051-24PI T89C2051 ic 89c2051