AT89C2051-24SC

Due to market price fluctuations,if you need to purchase or consult the price.You can contact us or emial to us:   sales@allicdata.com

1. Description

AT89C2051-24SC is a low-voltage, high-performance CMOS 8-bit microcomputer with 2K bytes of Flash programmable and erasable read-only memory (PEROM). This The device is manufactured using Atmel's high-density non-volatile storage technology And compatible with the industry standard MCS-51 instruction set. By combining one Atmel AT89C2051-24SC is a powerful microcomputer with powerful functions. It is a powerful microcomputer with a powerful microcomputer that can provide solutions for many applications. Embedded control application. AT89C2051-24SC provides the following standard functions: 2K bytes of flash memory, 128 RAM bytes, 15 I/O lines, two 16-bit timers/counters and a five-vector two-level interrupt Architecture, full-duplex serial port, precision analog comparator, on-chip oscillator And clock circuit. In addition, the AT89C2051-24SC has a static logic design, can operate at a low to zero frequency, and supports two software-selectable energy-saving methods mode. Idle mode stops the CPU, while allowing RAM, timer/counter, serial The port and interrupt system continue to operate. Power-down mode save RAM content, but freeze the oscillator, disable all other chip functions until the next Hardware reset

2. Features

   1. Compatible with MCS®-51Products

   2. 2K Bytes of Reprogrammable Flash Memory

       – Endurance: 10,000 Write/Erase Cycles

   3. 2.7V to 6V Operating Range

   4. Fully Static Operation: 0 Hz to 24 MHz

   5. Two-level Program Memory Lock

   6. 128 x 8-bit Internal RAM

   7. 15 Programmable I/O Lines

   8. Two 16-bit Timer/Counters

   9. Six Interrupt Sources

 10. Programmable Serial UART Channel

 11. Direct LED Drive Outputs

 12. On-chip Analog Comparator

 13. Low-power Idle and Power-down Modes

 14. Green (Pb/Halide-free) Packaging Option

3. Pin Configuration

4. Pin Description

    1. Port 1:

The Port 1 is an 8-bit bi-directional I/O port. Port pins P1.2 to P1.7 provide internal pull-ups. P1.0 and P1.1 require external pull-ups. P1.0 and P1.1 also serve as the positive input (AIN0) and the negative input (AIN1), respectively, of the on-chip precision analog comparator. The Port 1 output buffers can sink 20 mA and can drive LED displays directly. When 1s are written to Port 1 pins, they can be used as inputs. When pins P1.2 to P1.7 are used as inputs and are externally pulled low, they will source current (IIL) because of the internal pull-ups. Port 1 also receives code data during Flash programming and verification. 

    2. Port 3:

Port 3 pins P3.0 to P3.5, P3.7 are seven bi-directional I/O pins with internal pull-ups. P3.6 is hard-wired as an input to the output of the on-chip comparator and is not accessible as a general-purpose I/O pin. The Port 3 output buffers can sink 20 mA. When 1s are written to Port 3 pins they are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL) because of the pull-ups. Port 3 also serves the functions of various special features of the AT89C2051 as listed below:

5. Oscillator Characteristics

XTAL1 and XTAL2 are the input and output of the inverting amplifier respectively. The inverter can Configured to be used as an on-chip oscillator. Quartz crystal or Ceramic resonators can be used. To drive the device from an external clock source, XTAL2 , When driving XTAL1, it should remain unconnected. Due to the input of the internal clock, there is no requirement for the duty cycle of the external clock signal. The circuit is through a divide-by-two flip-flop, but the minimum and maximum voltages are high and low The time specifications must be adhered to.

6. Block Diagram

7. Package Information