Atmel AT89C2051 Manual

Features
®
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Compatible with MCS -51Products
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2K Bytes of Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
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2.7V to 6V Operating Range
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Fully Static Operation: 0 Hz to 24 MHz
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Two-level Program Memory Lock
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128 x 8-bit Internal RAM
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15 Programmable I/O Lines
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Two 16-bit Timer/Counters
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Six Interrupt Sources
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Programmable Serial UART Channel
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Direct LED Drive Outputs
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On-chip Analog Comparator
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Low-power Idle and Power-down Modes
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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
AT89C2051
0368G–MICRO–6/05