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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 AT89C4051 is a low-voltage, high-performance CMOS 8-bit microcontroller with 4K bytes of Flash programmable and eras
able read-only memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible
with the industry-standard MCS-51 instruction set.