Description
The AT89C4051 is a low-voltage, high-performance CMOS 8-bit microcontroller with 4K bytes of Flash programmable and erasable read-only memory. The device is manufactured using Atmelâs high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set. By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C4051 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.
The AT89C4051 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five-vector, two-level interrupt architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and clock circuitry. In addition, the AT89C4051 is designed with static logic for operation down to zero frequency and supports two software-selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.
Features
⢠Compatible with MCS®51 Products
⢠4K Bytes of Reprogrammable Flash Memory
  â Endurance: 1,000 Write/Erase Cycles
⢠2.7V 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
⢠Brown-out Detection
⢠Power-On Reset (POR)
⢠Green (Pb/Halide-free/RoHS Compliant) Packaging
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