| Flash (Kbytes) | 4 |
| RAM (Bytes) | 128 |
| F.max (MHz) | 24 |
| Vcc (V) | 2.7-6.0 |
| I/O Pins | 15 |
| UART | 1 |
| 16-bit Timers | 2 |
| Pb-Free Packages | SOIC 20 PDIP 20 |
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 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 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.
| Speed (MHz) | Power Supply |
Ordering Code | Package | Operation Range |
| 12 | 2.7V to 6.0V | AT89C4051-12PC AT89C4051-12SC |
20P3 20S |
Commercial (0°C to 70°C) |
| AT89C4051-12PI AT89C4051-12SI |
20P3 20S |
Industrial (-40°C to 85°C) | ||
| 24 | 4.0V to 6.0V | AT89C4051-24PC AT89C4051-24SC |
20P3 20S |
Commercial (0°C to 70°C) |
| AT89C4051-24PI AT89C4051-24SI |
20P3 20S |
Industrial (-40°C to 85°C) | ||
| 12 | 2.7V to 6.0V | AT89C4051-12PU AT89C4051-12SU |
20P3 20S |
Industrial (-40°C to 85°C) |
| 24 | 4.0V to 6.0V | AT89C4051-24PU AT89C4051-24SU |
20P3 20S |
Industrial (-40°C to 85°C) |
