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Features •Compatible with MCS ® -51Products •2K Bytes of Reprogrammable Flash Memory – Endurance: 10,000 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 •Green (Pb/Halide-free) Packaging Option 1. Description The AT89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K bytes of Flash programmable and erasable read-only memory (PEROM). The device is manufactured using Atmel’s 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 AT89C2051 is a power- ful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. The AT89C2051 provides the following standard features: 2K 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 AT89C2051 is designed with static logic for opera- tion 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. 8-bit Microcontroller with 2K Bytes Flash AT 8 9 C 2 0 5 1 0368H–MICRO–6/08