8-bit Microcontroller with 2K Bytes Flash AT89C2051
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 powerful 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 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.
2. Pin Configuration
2.1 20-lead PDIP/SOIC
3. Block Diagram
Absolute Maximum Ratings*
Operating Temperature ................................. -55°C to
+125°C
Storage Temperature ..................................... -65°C to
+150°C
Voltage on Any Pin
with Respect to Ground .....................................-1.0V
to +7.0V
Maximum Operating Voltage
............................................ 6.6V
DC Output
Current...................................................... 25.0
mA
*NOTICE: Stresses beyond those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any
other conditions beyond those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
