Atmel

AT89C4051 - 8 bit Microcontroller with 4k Byte Flash

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Features Compatible with MCS-51 Products 4K Bytes of Reprogrammable Flash Memory 2.7 to 6V Operating Range Fully Static Operation: 0 Hz to 24 MHz Two-level Program Memory Lock 128 x 8-bit Internal RAM 15 Programmable I/O Lines Two 16-bit Timer/Counters Six Interrupt Sources Programmable Serial UART Channel Direct LED Drive Outputs On-chip Analog Comparator Low-power Idle and Power-down Modes Brownout Protection 20-pin DIP

Pin Description Pin Number Description 1 RESET - Reset 2 P3.0 - Port 3 - RXD 3 P3.1 - Port 3 - TXD 4 XTAL2 - Crystal 5 XTAL1 - Crystal 6 P3.2 - Port 3 - INT0 7 P3.3 - Port 3 - INT1 8 P3.4 - Port 3 - TO 9 P3.5 - Port 3 - T1 10 GND - Ground 11 P3.7 - Port 3 12 P1.0 - Port 1 - AIN0 13 P1.1 - Port 1 - A1N1 14 P1.2 - Port 1 15 P1.3 - Port 1 16 P1.4 - Port 1 17 P1.5 - Port 1 18 P1.6 - Port 1 19 P1.7 - Port 1 20 Vcc - Positive Power Supply

Pin Layout Dimensional Drawing

Technical Data Data Sheet Atmel - Data Sheet for AT89C4051 Application Notes Atmel - 80 Series Application Notes